Finding the Fourth Proportional to 1,099.61, 1,646.88 and 636.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.61 : 1,646.88 = 636.24 : x
2. Step 2: Convert to fraction form
   1,099.61/1,646.88 = 636.24/x
3. Step 3: Cross multiply
   1,099.61x = 1,646.88 × 636.24
4. Step 4: Simplify right side
   1,099.61x = 1,047,809.04
5. Step 5: Solve for x
   x = 1,047,809.04/1,099.61
6. Step 6: Final answer
   x = 952.89