Finding the Fourth Proportional to 17,908.88, 26,842.42 and 13,158.16

Step by Step Solution

1. Step 1: Write the proportion equation
   17,908.88 : 26,842.42 = 13,158.16 : x
2. Step 2: Convert to fraction form
   17,908.88/26,842.42 = 13,158.16/x
3. Step 3: Cross multiply
   17,908.88x = 26,842.42 × 13,158.16
4. Step 4: Simplify right side
   17,908.88x = 353,196,857.15
5. Step 5: Solve for x
   x = 353,196,857.15/17,908.88
6. Step 6: Final answer
   x = 19,721.88