Finding the Fourth Proportional to 1,168.78, 1,753.71 and 519.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.78 : 1,753.71 = 519.94 : x
2. Step 2: Convert to fraction form
   1,168.78/1,753.71 = 519.94/x
3. Step 3: Cross multiply
   1,168.78x = 1,753.71 × 519.94
4. Step 4: Simplify right side
   1,168.78x = 911,823.98
5. Step 5: Solve for x
   x = 911,823.98/1,168.78
6. Step 6: Final answer
   x = 780.15