Finding the Fourth Proportional to 17,661.78, 26,488.17 and 5,178.42

Step by Step Solution

1. Step 1: Write the proportion equation
   17,661.78 : 26,488.17 = 5,178.42 : x
2. Step 2: Convert to fraction form
   17,661.78/26,488.17 = 5,178.42/x
3. Step 3: Cross multiply
   17,661.78x = 26,488.17 × 5,178.42
4. Step 4: Simplify right side
   17,661.78x = 137,166,869.29
5. Step 5: Solve for x
   x = 137,166,869.29/17,661.78
6. Step 6: Final answer
   x = 7,766.31