Finding the Fourth Proportional to 1,105.08, 1,525.04 and 639.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.08 : 1,525.04 = 639.33 : x
2. Step 2: Convert to fraction form
   1,105.08/1,525.04 = 639.33/x
3. Step 3: Cross multiply
   1,105.08x = 1,525.04 × 639.33
4. Step 4: Simplify right side
   1,105.08x = 975,003.82
5. Step 5: Solve for x
   x = 975,003.82/1,105.08
6. Step 6: Final answer
   x = 882.29