Finding the Fourth Proportional to 1,080.07, 1,490.00 and 686.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.07 : 1,490.00 = 686.81 : x
2. Step 2: Convert to fraction form
   1,080.07/1,490.00 = 686.81/x
3. Step 3: Cross multiply
   1,080.07x = 1,490.00 × 686.81
4. Step 4: Simplify right side
   1,080.07x = 1,023,347.19
5. Step 5: Solve for x
   x = 1,023,347.19/1,080.07
6. Step 6: Final answer
   x = 947.48