Finding the Fourth Proportional to 1,086.80, 1,630.89 and 625.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.80 : 1,630.89 = 625.49 : x
2. Step 2: Convert to fraction form
   1,086.80/1,630.89 = 625.49/x
3. Step 3: Cross multiply
   1,086.80x = 1,630.89 × 625.49
4. Step 4: Simplify right side
   1,086.80x = 1,020,097.23
5. Step 5: Solve for x
   x = 1,020,097.23/1,086.80
6. Step 6: Final answer
   x = 938.63