Finding the Fourth Proportional to 1,488.72, 2,231.54 and 610.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.72 : 2,231.54 = 610.86 : x
2. Step 2: Convert to fraction form
   1,488.72/2,231.54 = 610.86/x
3. Step 3: Cross multiply
   1,488.72x = 2,231.54 × 610.86
4. Step 4: Simplify right side
   1,488.72x = 1,363,158.52
5. Step 5: Solve for x
   x = 1,363,158.52/1,488.72
6. Step 6: Final answer
   x = 915.66