Finding the Fourth Proportional to 881.52, 1,216.59 and 660.09

Step by Step Solution

1. Step 1: Write the proportion equation
   881.52 : 1,216.59 = 660.09 : x
2. Step 2: Convert to fraction form
   881.52/1,216.59 = 660.09/x
3. Step 3: Cross multiply
   881.52x = 1,216.59 × 660.09
4. Step 4: Simplify right side
   881.52x = 803,058.89
5. Step 5: Solve for x
   x = 803,058.89/881.52
6. Step 6: Final answer
   x = 910.99