Finding the Fourth Proportional to 9,123.40, 12,589.52 and 5,145.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.40 : 12,589.52 = 5,145.48 : x
2. Step 2: Convert to fraction form
   9,123.40/12,589.52 = 5,145.48/x
3. Step 3: Cross multiply
   9,123.40x = 12,589.52 × 5,145.48
4. Step 4: Simplify right side
   9,123.40x = 64,779,123.37
5. Step 5: Solve for x
   x = 64,779,123.37/9,123.40
6. Step 6: Final answer
   x = 7,100.33