Finding the Fourth Proportional to 10,145.39, 15,223.55 and 7,679.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,145.39 : 15,223.55 = 7,679.61 : x
2. Step 2: Convert to fraction form
   10,145.39/15,223.55 = 7,679.61/x
3. Step 3: Cross multiply
   10,145.39x = 15,223.55 × 7,679.61
4. Step 4: Simplify right side
   10,145.39x = 116,910,888.42
5. Step 5: Solve for x
   x = 116,910,888.42/10,145.39
6. Step 6: Final answer
   x = 11,523.55