Finding the Fourth Proportional to 1,068.71, 1,603.49 and 520.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.71 : 1,603.49 = 520.83 : x
2. Step 2: Convert to fraction form
   1,068.71/1,603.49 = 520.83/x
3. Step 3: Cross multiply
   1,068.71x = 1,603.49 × 520.83
4. Step 4: Simplify right side
   1,068.71x = 835,145.70
5. Step 5: Solve for x
   x = 835,145.70/1,068.71
6. Step 6: Final answer
   x = 781.45