Finding the Fourth Proportional to 9,137.88, 12,608.86 and 5,158.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,137.88 : 12,608.86 = 5,158.91 : x
2. Step 2: Convert to fraction form
   9,137.88/12,608.86 = 5,158.91/x
3. Step 3: Cross multiply
   9,137.88x = 12,608.86 × 5,158.91
4. Step 4: Simplify right side
   9,137.88x = 65,047,980.88
5. Step 5: Solve for x
   x = 65,047,980.88/9,137.88
6. Step 6: Final answer
   x = 7,118.49