Finding the Fourth Proportional to 1,079.88, 1,490.94 and 830.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.88 : 1,490.94 = 830.76 : x
2. Step 2: Convert to fraction form
   1,079.88/1,490.94 = 830.76/x
3. Step 3: Cross multiply
   1,079.88x = 1,490.94 × 830.76
4. Step 4: Simplify right side
   1,079.88x = 1,238,613.31
5. Step 5: Solve for x
   x = 1,238,613.31/1,079.88
6. Step 6: Final answer
   x = 1,146.99