Finding the Fourth Proportional to 12,425.80, 18,595.69 and 7,680.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,425.80 : 18,595.69 = 7,680.01 : x
2. Step 2: Convert to fraction form
   12,425.80/18,595.69 = 7,680.01/x
3. Step 3: Cross multiply
   12,425.80x = 18,595.69 × 7,680.01
4. Step 4: Simplify right side
   12,425.80x = 142,815,085.16
5. Step 5: Solve for x
   x = 142,815,085.16/12,425.80
6. Step 6: Final answer
   x = 11,493.43