Finding the Fourth Proportional to 12,137.87, 18,213.89 and 5,117.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,137.87 : 18,213.89 = 5,117.46 : x
2. Step 2: Convert to fraction form
   12,137.87/18,213.89 = 5,117.46/x
3. Step 3: Cross multiply
   12,137.87x = 18,213.89 × 5,117.46
4. Step 4: Simplify right side
   12,137.87x = 93,208,853.52
5. Step 5: Solve for x
   x = 93,208,853.52/12,137.87
6. Step 6: Final answer
   x = 7,679.18