Finding the Fourth Proportional to 17,640.96, 26,463.58 and 7,782.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,640.96 : 26,463.58 = 7,782.72 : x
2. Step 2: Convert to fraction form
   17,640.96/26,463.58 = 7,782.72/x
3. Step 3: Cross multiply
   17,640.96x = 26,463.58 × 7,782.72
4. Step 4: Simplify right side
   17,640.96x = 205,958,633.34
5. Step 5: Solve for x
   x = 205,958,633.34/17,640.96
6. Step 6: Final answer
   x = 11,675.02