Finding the Fourth Proportional to 1,100.48, 1,650.56 and 638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.48 : 1,650.56 = 638.50 : x
2. Step 2: Convert to fraction form
   1,100.48/1,650.56 = 638.50/x
3. Step 3: Cross multiply
   1,100.48x = 1,650.56 × 638.50
4. Step 4: Simplify right side
   1,100.48x = 1,053,882.56
5. Step 5: Solve for x
   x = 1,053,882.56/1,100.48
6. Step 6: Final answer
   x = 957.66