Finding the Fourth Proportional to 429,470.72, 644,285.28 and 141,298.56

Step by Step Solution

1. Step 1: Write the proportion equation
   429,470.72 : 644,285.28 = 141,298.56 : x
2. Step 2: Convert to fraction form
   429,470.72/644,285.28 = 141,298.56/x
3. Step 3: Cross multiply
   429,470.72x = 644,285.28 × 141,298.56
4. Step 4: Simplify right side
   429,470.72x = 91,036,582,293.20
5. Step 5: Solve for x
   x = 91,036,582,293.20/429,470.72
6. Step 6: Final answer
   x = 211,973.90