Finding the Fourth Proportional to 2,641.78, 3,961.51 and 792.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.78 : 3,961.51 = 792.55 : x
2. Step 2: Convert to fraction form
   2,641.78/3,961.51 = 792.55/x
3. Step 3: Cross multiply
   2,641.78x = 3,961.51 × 792.55
4. Step 4: Simplify right side
   2,641.78x = 3,139,694.75
5. Step 5: Solve for x
   x = 3,139,694.75/2,641.78
6. Step 6: Final answer
   x = 1,188.48