Finding the Fourth Proportional to 9,123.31, 12,590.17 and 5,144.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.31 : 12,590.17 = 5,144.42 : x
2. Step 2: Convert to fraction form
   9,123.31/12,590.17 = 5,144.42/x
3. Step 3: Cross multiply
   9,123.31x = 12,590.17 × 5,144.42
4. Step 4: Simplify right side
   9,123.31x = 64,769,180.37
5. Step 5: Solve for x
   x = 64,769,180.37/9,123.31
6. Step 6: Final answer
   x = 7,099.31