Finding the Fourth Proportional to 12,288.89, 18,434.54 and 4,891.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.89 : 18,434.54 = 4,891.62 : x
2. Step 2: Convert to fraction form
   12,288.89/18,434.54 = 4,891.62/x
3. Step 3: Cross multiply
   12,288.89x = 18,434.54 × 4,891.62
4. Step 4: Simplify right side
   12,288.89x = 90,174,764.55
5. Step 5: Solve for x
   x = 90,174,764.55/12,288.89
6. Step 6: Final answer
   x = 7,337.91