Finding the Fourth Proportional to 72,831.72, 109,290.06 and 30,709.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,831.72 : 109,290.06 = 30,709.20 : x
2. Step 2: Convert to fraction form
   72,831.72/109,290.06 = 30,709.20/x
3. Step 3: Cross multiply
   72,831.72x = 109,290.06 × 30,709.20
4. Step 4: Simplify right side
   72,831.72x = 3,356,210,310.55
5. Step 5: Solve for x
   x = 3,356,210,310.55/72,831.72
6. Step 6: Final answer
   x = 46,081.71