Finding the Fourth Proportional to 153,978.76, 231,044.76 and 86,468.92

Step by Step Solution

1. Step 1: Write the proportion equation
   153,978.76 : 231,044.76 = 86,468.92 : x
2. Step 2: Convert to fraction form
   153,978.76/231,044.76 = 86,468.92/x
3. Step 3: Cross multiply
   153,978.76x = 231,044.76 × 86,468.92
4. Step 4: Simplify right side
   153,978.76x = 19,978,190,868.86
5. Step 5: Solve for x
   x = 19,978,190,868.86/153,978.76
6. Step 6: Final answer
   x = 129,746.41