Finding the Fourth Proportional to 1,105.02, 1,524.33 and 639.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.02 : 1,524.33 = 639.18 : x
2. Step 2: Convert to fraction form
   1,105.02/1,524.33 = 639.18/x
3. Step 3: Cross multiply
   1,105.02x = 1,524.33 × 639.18
4. Step 4: Simplify right side
   1,105.02x = 974,321.25
5. Step 5: Solve for x
   x = 974,321.25/1,105.02
6. Step 6: Final answer
   x = 881.72