Finding the Fourth Proportional to 152,910.48, 229,143.94 and 86,208.30

Step by Step Solution

1. Step 1: Write the proportion equation
   152,910.48 : 229,143.94 = 86,208.30 : x
2. Step 2: Convert to fraction form
   152,910.48/229,143.94 = 86,208.30/x
3. Step 3: Cross multiply
   152,910.48x = 229,143.94 × 86,208.30
4. Step 4: Simplify right side
   152,910.48x = 19,754,109,307.18
5. Step 5: Solve for x
   x = 19,754,109,307.18/152,910.48
6. Step 6: Final answer
   x = 129,187.41