Finding the Fourth Proportional to 1,105.50, 1,526.20 and 663.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.50 : 1,526.20 = 663.50 : x
2. Step 2: Convert to fraction form
   1,105.50/1,526.20 = 663.50/x
3. Step 3: Cross multiply
   1,105.50x = 1,526.20 × 663.50
4. Step 4: Simplify right side
   1,105.50x = 1,012,633.70
5. Step 5: Solve for x
   x = 1,012,633.70/1,105.50
6. Step 6: Final answer
   x = 916.00