Finding the Fourth Proportional to 142,792.61, 213,955.25 and 86,462.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,792.61 : 213,955.25 = 86,462.10 : x
2. Step 2: Convert to fraction form
   142,792.61/213,955.25 = 86,462.10/x
3. Step 3: Cross multiply
   142,792.61x = 213,955.25 × 86,462.10
4. Step 4: Simplify right side
   142,792.61x = 18,499,019,788.71
5. Step 5: Solve for x
   x = 18,499,019,788.71/142,792.61
6. Step 6: Final answer
   x = 129,551.67