Finding the Fourth Proportional to 5,469.78, 7,548.06 and 3,111.90

Step by Step Solution

1. Step 1: Write the proportion equation
   5,469.78 : 7,548.06 = 3,111.90 : x
2. Step 2: Convert to fraction form
   5,469.78/7,548.06 = 3,111.90/x
3. Step 3: Cross multiply
   5,469.78x = 7,548.06 × 3,111.90
4. Step 4: Simplify right side
   5,469.78x = 23,488,807.91
5. Step 5: Solve for x
   x = 23,488,807.91/5,469.78
6. Step 6: Final answer
   x = 4,294.29