Finding the Fourth Proportional to 12,092.78, 18,139.98 and 4,299.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,092.78 : 18,139.98 = 4,299.50 : x
2. Step 2: Convert to fraction form
   12,092.78/18,139.98 = 4,299.50/x
3. Step 3: Cross multiply
   12,092.78x = 18,139.98 × 4,299.50
4. Step 4: Simplify right side
   12,092.78x = 77,992,844.01
5. Step 5: Solve for x
   x = 77,992,844.01/12,092.78
6. Step 6: Final answer
   x = 6,449.54