Finding the Fourth Proportional to 1,079.86, 1,490.31 and 707.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.86 : 1,490.31 = 707.04 : x
2. Step 2: Convert to fraction form
   1,079.86/1,490.31 = 707.04/x
3. Step 3: Cross multiply
   1,079.86x = 1,490.31 × 707.04
4. Step 4: Simplify right side
   1,079.86x = 1,053,711.87
5. Step 5: Solve for x
   x = 1,053,711.87/1,079.86
6. Step 6: Final answer
   x = 975.79