Finding the Fourth Proportional to 87,131.96, 120,243.34 and 65,289.56

Step by Step Solution

1. Step 1: Write the proportion equation
   87,131.96 : 120,243.34 = 65,289.56 : x
2. Step 2: Convert to fraction form
   87,131.96/120,243.34 = 65,289.56/x
3. Step 3: Cross multiply
   87,131.96x = 120,243.34 × 65,289.56
4. Step 4: Simplify right side
   87,131.96x = 7,850,634,761.53
5. Step 5: Solve for x
   x = 7,850,634,761.53/87,131.96
6. Step 6: Final answer
   x = 90,100.52