Finding the Fourth Proportional to 103,592.72, 142,906.20 and 65,399.60

Step by Step Solution

1. Step 1: Write the proportion equation
   103,592.72 : 142,906.20 = 65,399.60 : x
2. Step 2: Convert to fraction form
   103,592.72/142,906.20 = 65,399.60/x
3. Step 3: Cross multiply
   103,592.72x = 142,906.20 × 65,399.60
4. Step 4: Simplify right side
   103,592.72x = 9,346,008,317.52
5. Step 5: Solve for x
   x = 9,346,008,317.52/103,592.72
6. Step 6: Final answer
   x = 90,218.78