Finding the Fourth Proportional to 1,079.69, 1,490.01 and 686.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.69 : 1,490.01 = 686.71 : x
2. Step 2: Convert to fraction form
   1,079.69/1,490.01 = 686.71/x
3. Step 3: Cross multiply
   1,079.69x = 1,490.01 × 686.71
4. Step 4: Simplify right side
   1,079.69x = 1,023,197.32
5. Step 5: Solve for x
   x = 1,023,197.32/1,079.69
6. Step 6: Final answer
   x = 947.68