Finding the Fourth Proportional to 8,123.30, 12,185.72 and 2,279.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,123.30 : 12,185.72 = 2,279.88 : x
2. Step 2: Convert to fraction form
   8,123.30/12,185.72 = 2,279.88/x
3. Step 3: Cross multiply
   8,123.30x = 12,185.72 × 2,279.88
4. Step 4: Simplify right side
   8,123.30x = 27,781,979.31
5. Step 5: Solve for x
   x = 27,781,979.31/8,123.30
6. Step 6: Final answer
   x = 3,420.04