Finding the Fourth Proportional to 9,115.94, 12,580.25 and 5,137.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,115.94 : 12,580.25 = 5,137.43 : x
2. Step 2: Convert to fraction form
   9,115.94/12,580.25 = 5,137.43/x
3. Step 3: Cross multiply
   9,115.94x = 12,580.25 × 5,137.43
4. Step 4: Simplify right side
   9,115.94x = 64,630,065.17
5. Step 5: Solve for x
   x = 64,630,065.17/9,115.94
6. Step 6: Final answer
   x = 7,089.78