Finding the Fourth Proportional to 2,086.43, 3,128.72 and 625.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.43 : 3,128.72 = 625.30 : x
2. Step 2: Convert to fraction form
   2,086.43/3,128.72 = 625.30/x
3. Step 3: Cross multiply
   2,086.43x = 3,128.72 × 625.30
4. Step 4: Simplify right side
   2,086.43x = 1,956,377.67
5. Step 5: Solve for x
   x = 1,956,377.67/2,086.43
6. Step 6: Final answer
   x = 937.67