Finding the Fourth Proportional to 17,679.10, 26,515.41 and 7,148.56

Step by Step Solution

1. Step 1: Write the proportion equation
   17,679.10 : 26,515.41 = 7,148.56 : x
2. Step 2: Convert to fraction form
   17,679.10/26,515.41 = 7,148.56/x
3. Step 3: Cross multiply
   17,679.10x = 26,515.41 × 7,148.56
4. Step 4: Simplify right side
   17,679.10x = 189,546,999.31
5. Step 5: Solve for x
   x = 189,546,999.31/17,679.10
6. Step 6: Final answer
   x = 10,721.53