Finding the Fourth Proportional to 9,158.57, 12,638.15 and 5,124.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,158.57 : 12,638.15 = 5,124.87 : x
2. Step 2: Convert to fraction form
   9,158.57/12,638.15 = 5,124.87/x
3. Step 3: Cross multiply
   9,158.57x = 12,638.15 × 5,124.87
4. Step 4: Simplify right side
   9,158.57x = 64,768,888.60
5. Step 5: Solve for x
   x = 64,768,888.60/9,158.57
6. Step 6: Final answer
   x = 7,071.94