Finding the Fourth Proportional to 12,928.10, 17,842.48 and 7,623.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.10 : 17,842.48 = 7,623.42 : x
2. Step 2: Convert to fraction form
   12,928.10/17,842.48 = 7,623.42/x
3. Step 3: Cross multiply
   12,928.10x = 17,842.48 × 7,623.42
4. Step 4: Simplify right side
   12,928.10x = 136,020,718.88
5. Step 5: Solve for x
   x = 136,020,718.88/12,928.10
6. Step 6: Final answer
   x = 10,521.32