Finding the Fourth Proportional to 12,842.60, 17,718.63 and 7,538.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,842.60 : 17,718.63 = 7,538.72 : x
2. Step 2: Convert to fraction form
   12,842.60/17,718.63 = 7,538.72/x
3. Step 3: Cross multiply
   12,842.60x = 17,718.63 × 7,538.72
4. Step 4: Simplify right side
   12,842.60x = 133,575,790.35
5. Step 5: Solve for x
   x = 133,575,790.35/12,842.60
6. Step 6: Final answer
   x = 10,400.99