Finding the Fourth Proportional to 17,953.78, 24,782.61 and 12,920.98

Step by Step Solution

1. Step 1: Write the proportion equation
   17,953.78 : 24,782.61 = 12,920.98 : x
2. Step 2: Convert to fraction form
   17,953.78/24,782.61 = 12,920.98/x
3. Step 3: Cross multiply
   17,953.78x = 24,782.61 × 12,920.98
4. Step 4: Simplify right side
   17,953.78x = 320,215,608.16
5. Step 5: Solve for x
   x = 320,215,608.16/17,953.78
6. Step 6: Final answer
   x = 17,835.55