Finding the Fourth Proportional to 425,665.43, 638,479.65 and 105,810.53

Step by Step Solution

1. Step 1: Write the proportion equation
   425,665.43 : 638,479.65 = 105,810.53 : x
2. Step 2: Convert to fraction form
   425,665.43/638,479.65 = 105,810.53/x
3. Step 3: Cross multiply
   425,665.43x = 638,479.65 × 105,810.53
4. Step 4: Simplify right side
   425,665.43x = 67,557,870,160.71
5. Step 5: Solve for x
   x = 67,557,870,160.71/425,665.43
6. Step 6: Final answer
   x = 158,711.20