Finding the Fourth Proportional to 152,911.98, 229,146.18 and 86,209.80

Step by Step Solution

1. Step 1: Write the proportion equation
   152,911.98 : 229,146.18 = 86,209.80 : x
2. Step 2: Convert to fraction form
   152,911.98/229,146.18 = 86,209.80/x
3. Step 3: Cross multiply
   152,911.98x = 229,146.18 × 86,209.80
4. Step 4: Simplify right side
   152,911.98x = 19,754,646,348.56
5. Step 5: Solve for x
   x = 19,754,646,348.56/152,911.98
6. Step 6: Final answer
   x = 129,189.66