Finding the Fourth Proportional to 1,079.69, 1,490.15 and 637.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.69 : 1,490.15 = 637.61 : x
2. Step 2: Convert to fraction form
   1,079.69/1,490.15 = 637.61/x
3. Step 3: Cross multiply
   1,079.69x = 1,490.15 × 637.61
4. Step 4: Simplify right side
   1,079.69x = 950,128.68
5. Step 5: Solve for x
   x = 950,128.68/1,079.69
6. Step 6: Final answer
   x = 880.01