Finding the Fourth Proportional to 412,866.27, 619,150.71 and 142,921.05

Step by Step Solution

1. Step 1: Write the proportion equation
   412,866.27 : 619,150.71 = 142,921.05 : x
2. Step 2: Convert to fraction form
   412,866.27/619,150.71 = 142,921.05/x
3. Step 3: Cross multiply
   412,866.27x = 619,150.71 × 142,921.05
4. Step 4: Simplify right side
   412,866.27x = 88,489,669,581.45
5. Step 5: Solve for x
   x = 88,489,669,581.45/412,866.27
6. Step 6: Final answer
   x = 214,330.10