Finding the Fourth Proportional to 1,101.76, 1,520.56 and 708.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.76 : 1,520.56 = 708.88 : x
2. Step 2: Convert to fraction form
   1,101.76/1,520.56 = 708.88/x
3. Step 3: Cross multiply
   1,101.76x = 1,520.56 × 708.88
4. Step 4: Simplify right side
   1,101.76x = 1,077,894.57
5. Step 5: Solve for x
   x = 1,077,894.57/1,101.76
6. Step 6: Final answer
   x = 978.34