Finding the Fourth Proportional to 2,740.47, 4,111.20 and 792.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.47 : 4,111.20 = 792.78 : x
2. Step 2: Convert to fraction form
   2,740.47/4,111.20 = 792.78/x
3. Step 3: Cross multiply
   2,740.47x = 4,111.20 × 792.78
4. Step 4: Simplify right side
   2,740.47x = 3,259,277.14
5. Step 5: Solve for x
   x = 3,259,277.14/2,740.47
6. Step 6: Final answer
   x = 1,189.31