Finding the Fourth Proportional to 5,256.78, 7,877.72 and 2,792.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,256.78 : 7,877.72 = 2,792.76 : x
2. Step 2: Convert to fraction form
   5,256.78/7,877.72 = 2,792.76/x
3. Step 3: Cross multiply
   5,256.78x = 7,877.72 × 2,792.76
4. Step 4: Simplify right side
   5,256.78x = 22,000,581.31
5. Step 5: Solve for x
   x = 22,000,581.31/5,256.78
6. Step 6: Final answer
   x = 4,185.18