Finding the Fourth Proportional to 402,650.72, 604,442.64 and 216,026.72

Step by Step Solution

1. Step 1: Write the proportion equation
   402,650.72 : 604,442.64 = 216,026.72 : x
2. Step 2: Convert to fraction form
   402,650.72/604,442.64 = 216,026.72/x
3. Step 3: Cross multiply
   402,650.72x = 604,442.64 × 216,026.72
4. Step 4: Simplify right side
   402,650.72x = 130,575,760,947.34
5. Step 5: Solve for x
   x = 130,575,760,947.34/402,650.72
6. Step 6: Final answer
   x = 324,290.39