Finding the Fourth Proportional to 1,080.29, 1,490.79 and 707.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.29 : 1,490.79 = 707.88 : x
2. Step 2: Convert to fraction form
   1,080.29/1,490.79 = 707.88/x
3. Step 3: Cross multiply
   1,080.29x = 1,490.79 × 707.88
4. Step 4: Simplify right side
   1,080.29x = 1,055,300.43
5. Step 5: Solve for x
   x = 1,055,300.43/1,080.29
6. Step 6: Final answer
   x = 976.87