Finding the Fourth Proportional to 5,268.78, 7,907.72 and 2,931.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,268.78 : 7,907.72 = 2,931.12 : x
2. Step 2: Convert to fraction form
   5,268.78/7,907.72 = 2,931.12/x
3. Step 3: Cross multiply
   5,268.78x = 7,907.72 × 2,931.12
4. Step 4: Simplify right side
   5,268.78x = 23,178,461.59
5. Step 5: Solve for x
   x = 23,178,461.59/5,268.78
6. Step 6: Final answer
   x = 4,399.21