Finding the Fourth Proportional to 17,722.72, 26,577.84 and 5,239.40

Step by Step Solution

1. Step 1: Write the proportion equation
   17,722.72 : 26,577.84 = 5,239.40 : x
2. Step 2: Convert to fraction form
   17,722.72/26,577.84 = 5,239.40/x
3. Step 3: Cross multiply
   17,722.72x = 26,577.84 × 5,239.40
4. Step 4: Simplify right side
   17,722.72x = 139,251,934.90
5. Step 5: Solve for x
   x = 139,251,934.90/17,722.72
6. Step 6: Final answer
   x = 7,857.26