Finding the Fourth Proportional to 402,706.61, 555,736.55 and 221,429.94

Step by Step Solution

1. Step 1: Write the proportion equation
   402,706.61 : 555,736.55 = 221,429.94 : x
2. Step 2: Convert to fraction form
   402,706.61/555,736.55 = 221,429.94/x
3. Step 3: Cross multiply
   402,706.61x = 555,736.55 × 221,429.94
4. Step 4: Simplify right side
   402,706.61x = 123,056,710,922.31
5. Step 5: Solve for x
   x = 123,056,710,922.31/402,706.61
6. Step 6: Final answer
   x = 305,574.10