Finding the Fourth Proportional to 9,123.60, 12,590.58 and 5,144.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.60 : 12,590.58 = 5,144.76 : x
2. Step 2: Convert to fraction form
   9,123.60/12,590.58 = 5,144.76/x
3. Step 3: Cross multiply
   9,123.60x = 12,590.58 × 5,144.76
4. Step 4: Simplify right side
   9,123.60x = 64,775,512.36
5. Step 5: Solve for x
   x = 64,775,512.36/9,123.60
6. Step 6: Final answer
   x = 7,099.78