Finding the Fourth Proportional to 142,870.87, 214,350.93 and 86,007.04

Step by Step Solution

1. Step 1: Write the proportion equation
   142,870.87 : 214,350.93 = 86,007.04 : x
2. Step 2: Convert to fraction form
   142,870.87/214,350.93 = 86,007.04/x
3. Step 3: Cross multiply
   142,870.87x = 214,350.93 × 86,007.04
4. Step 4: Simplify right side
   142,870.87x = 18,435,689,010.55
5. Step 5: Solve for x
   x = 18,435,689,010.55/142,870.87
6. Step 6: Final answer
   x = 129,037.42