Finding the Fourth Proportional to 402,714.42, 555,760.18 and 221,440.16

Step by Step Solution

1. Step 1: Write the proportion equation
   402,714.42 : 555,760.18 = 221,440.16 : x
2. Step 2: Convert to fraction form
   402,714.42/555,760.18 = 221,440.16/x
3. Step 3: Cross multiply
   402,714.42x = 555,760.18 × 221,440.16
4. Step 4: Simplify right side
   402,714.42x = 123,067,623,180.83
5. Step 5: Solve for x
   x = 123,067,623,180.83/402,714.42
6. Step 6: Final answer
   x = 305,595.27