Finding the Fourth Proportional to 2,086.47, 3,129.72 and 625.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.47 : 3,129.72 = 625.65 : x
2. Step 2: Convert to fraction form
   2,086.47/3,129.72 = 625.65/x
3. Step 3: Cross multiply
   2,086.47x = 3,129.72 × 625.65
4. Step 4: Simplify right side
   2,086.47x = 1,958,109.32
5. Step 5: Solve for x
   x = 1,958,109.32/2,086.47
6. Step 6: Final answer
   x = 938.48