Finding the Fourth Proportional to 1,039.62, 1,434.18 and 619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.62 : 1,434.18 = 619.72 : x
2. Step 2: Convert to fraction form
   1,039.62/1,434.18 = 619.72/x
3. Step 3: Cross multiply
   1,039.62x = 1,434.18 × 619.72
4. Step 4: Simplify right side
   1,039.62x = 888,790.03
5. Step 5: Solve for x
   x = 888,790.03/1,039.62
6. Step 6: Final answer
   x = 854.92