Finding the Fourth Proportional to 2,617.48, 3,926.58 and 768.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.48 : 3,926.58 = 768.72 : x
2. Step 2: Convert to fraction form
   2,617.48/3,926.58 = 768.72/x
3. Step 3: Cross multiply
   2,617.48x = 3,926.58 × 768.72
4. Step 4: Simplify right side
   2,617.48x = 3,018,440.58
5. Step 5: Solve for x
   x = 3,018,440.58/2,617.48
6. Step 6: Final answer
   x = 1,153.19