Finding the Fourth Proportional to 1,098.50, 1,515.72 and 656.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.50 : 1,515.72 = 656.48 : x
2. Step 2: Convert to fraction form
   1,098.50/1,515.72 = 656.48/x
3. Step 3: Cross multiply
   1,098.50x = 1,515.72 × 656.48
4. Step 4: Simplify right side
   1,098.50x = 995,039.87
5. Step 5: Solve for x
   x = 995,039.87/1,098.50
6. Step 6: Final answer
   x = 905.82