Finding the Fourth Proportional to 429,779.28, 644,797.71 and 173,479.89

Step by Step Solution

1. Step 1: Write the proportion equation
   429,779.28 : 644,797.71 = 173,479.89 : x
2. Step 2: Convert to fraction form
   429,779.28/644,797.71 = 173,479.89/x
3. Step 3: Cross multiply
   429,779.28x = 644,797.71 × 173,479.89
4. Step 4: Simplify right side
   429,779.28x = 111,859,435,803.05
5. Step 5: Solve for x
   x = 111,859,435,803.05/429,779.28
6. Step 6: Final answer
   x = 260,271.82