Finding the Fourth Proportional to 113,613, 169,618.20 and 86,817.48

Step by Step Solution

1. Step 1: Write the proportion equation
   113,613 : 169,618.20 = 86,817.48 : x
2. Step 2: Convert to fraction form
   113,613/169,618.20 = 86,817.48/x
3. Step 3: Cross multiply
   113,613x = 169,618.20 × 86,817.48
4. Step 4: Simplify right side
   113,613x = 14,725,824,686.14
5. Step 5: Solve for x
   x = 14,725,824,686.14/113,613
6. Step 6: Final answer
   x = 129,613.91