Finding the Fourth Proportional to 1,099.55, 1,517.57 and 657.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.55 : 1,517.57 = 657.50 : x
2. Step 2: Convert to fraction form
   1,099.55/1,517.57 = 657.50/x
3. Step 3: Cross multiply
   1,099.55x = 1,517.57 × 657.50
4. Step 4: Simplify right side
   1,099.55x = 997,796.33
5. Step 5: Solve for x
   x = 997,796.33/1,099.55
6. Step 6: Final answer
   x = 907.46