Finding the Fourth Proportional to 1,008.59, 1,392.03 and 635.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.59 : 1,392.03 = 635.28 : x
2. Step 2: Convert to fraction form
   1,008.59/1,392.03 = 635.28/x
3. Step 3: Cross multiply
   1,008.59x = 1,392.03 × 635.28
4. Step 4: Simplify right side
   1,008.59x = 884,328.82
5. Step 5: Solve for x
   x = 884,328.82/1,008.59
6. Step 6: Final answer
   x = 876.80