Finding the Fourth Proportional to 7,790.42, 11,727.72 and 7,112.45

Step by Step Solution

1. Step 1: Write the proportion equation
   7,790.42 : 11,727.72 = 7,112.45 : x
2. Step 2: Convert to fraction form
   7,790.42/11,727.72 = 7,112.45/x
3. Step 3: Cross multiply
   7,790.42x = 11,727.72 × 7,112.45
4. Step 4: Simplify right side
   7,790.42x = 83,412,851.43
5. Step 5: Solve for x
   x = 83,412,851.43/7,790.42
6. Step 6: Final answer
   x = 10,707.10