Finding the Fourth Proportional to 142,321.86, 213,513.30 and 42,489.90

Step by Step Solution

1. Step 1: Write the proportion equation
   142,321.86 : 213,513.30 = 42,489.90 : x
2. Step 2: Convert to fraction form
   142,321.86/213,513.30 = 42,489.90/x
3. Step 3: Cross multiply
   142,321.86x = 213,513.30 × 42,489.90
4. Step 4: Simplify right side
   142,321.86x = 9,072,158,765.67
5. Step 5: Solve for x
   x = 9,072,158,765.67/142,321.86
6. Step 6: Final answer
   x = 63,743.96