Finding the Fourth Proportional to 1,017.15, 1,401.78 and 768.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.15 : 1,401.78 = 768.08 : x
2. Step 2: Convert to fraction form
   1,017.15/1,401.78 = 768.08/x
3. Step 3: Cross multiply
   1,017.15x = 1,401.78 × 768.08
4. Step 4: Simplify right side
   1,017.15x = 1,076,672.17
5. Step 5: Solve for x
   x = 1,076,672.17/1,017.15
6. Step 6: Final answer
   x = 1,058.52