Finding the Fourth Proportional to 1,079.90, 1,490.18 and 707.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.90 : 1,490.18 = 707.61 : x
2. Step 2: Convert to fraction form
   1,079.90/1,490.18 = 707.61/x
3. Step 3: Cross multiply
   1,079.90x = 1,490.18 × 707.61
4. Step 4: Simplify right side
   1,079.90x = 1,054,462.73
5. Step 5: Solve for x
   x = 1,054,462.73/1,079.90
6. Step 6: Final answer
   x = 976.45