Finding the Fourth Proportional to 1,105.79, 1,526.04 and 663.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.79 : 1,526.04 = 663.71 : x
2. Step 2: Convert to fraction form
   1,105.79/1,526.04 = 663.71/x
3. Step 3: Cross multiply
   1,105.79x = 1,526.04 × 663.71
4. Step 4: Simplify right side
   1,105.79x = 1,012,840.38
5. Step 5: Solve for x
   x = 1,012,840.38/1,105.79
6. Step 6: Final answer
   x = 915.95