Finding the Fourth Proportional to 1,079.61, 1,489.98 and 637.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.61 : 1,489.98 = 637.50 : x
2. Step 2: Convert to fraction form
   1,079.61/1,489.98 = 637.50/x
3. Step 3: Cross multiply
   1,079.61x = 1,489.98 × 637.50
4. Step 4: Simplify right side
   1,079.61x = 949,862.25
5. Step 5: Solve for x
   x = 949,862.25/1,079.61
6. Step 6: Final answer
   x = 879.82