Finding the Fourth Proportional to 425,128.55, 637,682.18 and 172,341.43

Step by Step Solution

1. Step 1: Write the proportion equation
   425,128.55 : 637,682.18 = 172,341.43 : x
2. Step 2: Convert to fraction form
   425,128.55/637,682.18 = 172,341.43/x
3. Step 3: Cross multiply
   425,128.55x = 637,682.18 × 172,341.43
4. Step 4: Simplify right side
   425,128.55x = 109,899,056,330.81
5. Step 5: Solve for x
   x = 109,899,056,330.81/425,128.55
6. Step 6: Final answer
   x = 258,507.83