Finding the Fourth Proportional to 647,731.31, 971,609.13 and 221,364.72

Step by Step Solution

1. Step 1: Write the proportion equation
   647,731.31 : 971,609.13 = 221,364.72 : x
2. Step 2: Convert to fraction form
   647,731.31/971,609.13 = 221,364.72/x
3. Step 3: Cross multiply
   647,731.31x = 971,609.13 × 221,364.72
4. Step 4: Simplify right side
   647,731.31x = 215,079,983,011.89
5. Step 5: Solve for x
   x = 215,079,983,011.89/647,731.31
6. Step 6: Final answer
   x = 332,051.24