Finding the Fourth Proportional to 12,291.78, 18,426.60 and 4,498.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,291.78 : 18,426.60 = 4,498.77 : x
2. Step 2: Convert to fraction form
   12,291.78/18,426.60 = 4,498.77/x
3. Step 3: Cross multiply
   12,291.78x = 18,426.60 × 4,498.77
4. Step 4: Simplify right side
   12,291.78x = 82,897,035.28
5. Step 5: Solve for x
   x = 82,897,035.28/12,291.78
6. Step 6: Final answer
   x = 6,744.10