Finding the Fourth Proportional to 2,892.78, 4,339.20 and 1,161

Step by Step Solution

1. Step 1: Write the proportion equation
   2,892.78 : 4,339.20 = 1,161 : x
2. Step 2: Convert to fraction form
   2,892.78/4,339.20 = 1,161/x
3. Step 3: Cross multiply
   2,892.78x = 4,339.20 × 1,161
4. Step 4: Simplify right side
   2,892.78x = 5,037,811.20
5. Step 5: Solve for x
   x = 5,037,811.20/2,892.78
6. Step 6: Final answer
   x = 1,741.51