Finding the Fourth Proportional to 429,472.72, 644,288.28 and 141,300.56

Step by Step Solution

1. Step 1: Write the proportion equation
   429,472.72 : 644,288.28 = 141,300.56 : x
2. Step 2: Convert to fraction form
   429,472.72/644,288.28 = 141,300.56/x
3. Step 3: Cross multiply
   429,472.72x = 644,288.28 × 141,300.56
4. Step 4: Simplify right side
   429,472.72x = 91,038,294,765.44
5. Step 5: Solve for x
   x = 91,038,294,765.44/429,472.72
6. Step 6: Final answer
   x = 211,976.90