Finding the Fourth Proportional to 402,443.59, 555,385.06 and 221,172.27

Step by Step Solution

1. Step 1: Write the proportion equation
   402,443.59 : 555,385.06 = 221,172.27 : x
2. Step 2: Convert to fraction form
   402,443.59/555,385.06 = 221,172.27/x
3. Step 3: Cross multiply
   402,443.59x = 555,385.06 × 221,172.27
4. Step 4: Simplify right side
   402,443.59x = 122,835,774,444.29
5. Step 5: Solve for x
   x = 122,835,774,444.29/402,443.59
6. Step 6: Final answer
   x = 305,224.83