Finding the Fourth Proportional to 275,411.31, 412,784.78 and 142,218.96

Step by Step Solution

1. Step 1: Write the proportion equation
   275,411.31 : 412,784.78 = 142,218.96 : x
2. Step 2: Convert to fraction form
   275,411.31/412,784.78 = 142,218.96/x
3. Step 3: Cross multiply
   275,411.31x = 412,784.78 × 142,218.96
4. Step 4: Simplify right side
   275,411.31x = 58,705,821,404.33
5. Step 5: Solve for x
   x = 58,705,821,404.33/275,411.31
6. Step 6: Final answer
   x = 213,156.90