Finding the Fourth Proportional to 1,105.71, 1,526.01 and 663.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.71 : 1,526.01 = 663.60 : x
2. Step 2: Convert to fraction form
   1,105.71/1,526.01 = 663.60/x
3. Step 3: Cross multiply
   1,105.71x = 1,526.01 × 663.60
4. Step 4: Simplify right side
   1,105.71x = 1,012,660.24
5. Step 5: Solve for x
   x = 1,012,660.24/1,105.71
6. Step 6: Final answer
   x = 915.85