Finding the Fourth Proportional to 1,034.76, 1,429.20 and 839.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.76 : 1,429.20 = 839.28 : x
2. Step 2: Convert to fraction form
   1,034.76/1,429.20 = 839.28/x
3. Step 3: Cross multiply
   1,034.76x = 1,429.20 × 839.28
4. Step 4: Simplify right side
   1,034.76x = 1,199,498.98
5. Step 5: Solve for x
   x = 1,199,498.98/1,034.76
6. Step 6: Final answer
   x = 1,159.21