Finding the Fourth Proportional to 1,098.59, 1,515.98 and 626.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.59 : 1,515.98 = 626.56 : x
2. Step 2: Convert to fraction form
   1,098.59/1,515.98 = 626.56/x
3. Step 3: Cross multiply
   1,098.59x = 1,515.98 × 626.56
4. Step 4: Simplify right side
   1,098.59x = 949,850.21
5. Step 5: Solve for x
   x = 949,850.21/1,098.59
6. Step 6: Final answer
   x = 864.61