Finding the Fourth Proportional to 142,086.10, 213,129.15 and 82,891.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,086.10 : 213,129.15 = 82,891.30 : x
2. Step 2: Convert to fraction form
   142,086.10/213,129.15 = 82,891.30/x
3. Step 3: Cross multiply
   142,086.10x = 213,129.15 × 82,891.30
4. Step 4: Simplify right side
   142,086.10x = 17,666,552,311.40
5. Step 5: Solve for x
   x = 17,666,552,311.40/142,086.10
6. Step 6: Final answer
   x = 124,336.95