Finding the Fourth Proportional to 142,321.50, 213,503.10 and 58,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,321.50 : 213,503.10 = 58,086.78 : x
2. Step 2: Convert to fraction form
   142,321.50/213,503.10 = 58,086.78/x
3. Step 3: Cross multiply
   142,321.50x = 213,503.10 × 58,086.78
4. Step 4: Simplify right side
   142,321.50x = 12,401,707,599.02
5. Step 5: Solve for x
   x = 12,401,707,599.02/142,321.50
6. Step 6: Final answer
   x = 87,138.68