Finding the Fourth Proportional to 11,642.78, 17,374.72 and 10,397.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,642.78 : 17,374.72 = 10,397.18 : x
2. Step 2: Convert to fraction form
   11,642.78/17,374.72 = 10,397.18/x
3. Step 3: Cross multiply
   11,642.78x = 17,374.72 × 10,397.18
4. Step 4: Simplify right side
   11,642.78x = 180,648,091.29
5. Step 5: Solve for x
   x = 180,648,091.29/11,642.78
6. Step 6: Final answer
   x = 15,515.89