Finding the Fourth Proportional to 1,039.88, 1,435.04 and 567.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.88 : 1,435.04 = 567.78 : x
2. Step 2: Convert to fraction form
   1,039.88/1,435.04 = 567.78/x
3. Step 3: Cross multiply
   1,039.88x = 1,435.04 × 567.78
4. Step 4: Simplify right side
   1,039.88x = 814,784.17
5. Step 5: Solve for x
   x = 814,784.17/1,039.88
6. Step 6: Final answer
   x = 783.53