Finding the Fourth Proportional to 12,490.61, 18,714.89 and 5,819.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,490.61 : 18,714.89 = 5,819.92 : x
2. Step 2: Convert to fraction form
   12,490.61/18,714.89 = 5,819.92/x
3. Step 3: Cross multiply
   12,490.61x = 18,714.89 × 5,819.92
4. Step 4: Simplify right side
   12,490.61x = 108,919,130.37
5. Step 5: Solve for x
   x = 108,919,130.37/12,490.61
6. Step 6: Final answer
   x = 8,720.08