Finding the Fourth Proportional to 1,311,091,790.72, 1,809,252,831.98 and 716,396,690.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311,091,790.72 : 1,809,252,831.98 = 716,396,690.28 : x
2. Step 2: Convert to fraction form
   1,311,091,790.72/1,809,252,831.98 = 716,396,690.28/x
3. Step 3: Cross multiply
   1,311,091,790.72x = 1,809,252,831.98 × 716,396,690.28
4. Step 4: Simplify right side
   1,311,091,790.72x = 1,296,142,740,710,188,800
5. Step 5: Solve for x
   x = 1,296,142,740,710,188,800/1,311,091,790.72
6. Step 6: Final answer
   x = 988,598,014.18