Finding the Fourth Proportional to 9,123.80, 12,590.60 and 5,144.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.80 : 12,590.60 = 5,144.76 : x
2. Step 2: Convert to fraction form
   9,123.80/12,590.60 = 5,144.76/x
3. Step 3: Cross multiply
   9,123.80x = 12,590.60 × 5,144.76
4. Step 4: Simplify right side
   9,123.80x = 64,775,615.26
5. Step 5: Solve for x
   x = 64,775,615.26/9,123.80
6. Step 6: Final answer
   x = 7,099.63