Finding the Fourth Proportional to 142,018.50, 212,991.20 and 42,155.04

Step by Step Solution

1. Step 1: Write the proportion equation
   142,018.50 : 212,991.20 = 42,155.04 : x
2. Step 2: Convert to fraction form
   142,018.50/212,991.20 = 42,155.04/x
3. Step 3: Cross multiply
   142,018.50x = 212,991.20 × 42,155.04
4. Step 4: Simplify right side
   142,018.50x = 8,978,651,490.69
5. Step 5: Solve for x
   x = 8,978,651,490.69/142,018.50
6. Step 6: Final answer
   x = 63,221.71