Finding the Fourth Proportional to 915.56, 1,259.71 and 790.82

Step by Step Solution

1. Step 1: Write the proportion equation
   915.56 : 1,259.71 = 790.82 : x
2. Step 2: Convert to fraction form
   915.56/1,259.71 = 790.82/x
3. Step 3: Cross multiply
   915.56x = 1,259.71 × 790.82
4. Step 4: Simplify right side
   915.56x = 996,203.86
5. Step 5: Solve for x
   x = 996,203.86/915.56
6. Step 6: Final answer
   x = 1,088.08