Finding the Fourth Proportional to 9,123.35, 12,590.20 and 5,144.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.35 : 12,590.20 = 5,144.43 : x
2. Step 2: Convert to fraction form
   9,123.35/12,590.20 = 5,144.43/x
3. Step 3: Cross multiply
   9,123.35x = 12,590.20 × 5,144.43
4. Step 4: Simplify right side
   9,123.35x = 64,769,402.59
5. Step 5: Solve for x
   x = 64,769,402.59/9,123.35
6. Step 6: Final answer
   x = 7,099.30