Finding the Fourth Proportional to 402,751.27, 555,805.89 and 221,473.27

Step by Step Solution

1. Step 1: Write the proportion equation
   402,751.27 : 555,805.89 = 221,473.27 : x
2. Step 2: Convert to fraction form
   402,751.27/555,805.89 = 221,473.27/x
3. Step 3: Cross multiply
   402,751.27x = 555,805.89 × 221,473.27
4. Step 4: Simplify right side
   402,751.27x = 123,096,144,057.17
5. Step 5: Solve for x
   x = 123,096,144,057.17/402,751.27
6. Step 6: Final answer
   x = 305,638.13