Finding the Fourth Proportional to 52,403.52, 78,605.34 and 12,960.06

Step by Step Solution

1. Step 1: Write the proportion equation
   52,403.52 : 78,605.34 = 12,960.06 : x
2. Step 2: Convert to fraction form
   52,403.52/78,605.34 = 12,960.06/x
3. Step 3: Cross multiply
   52,403.52x = 78,605.34 × 12,960.06
4. Step 4: Simplify right side
   52,403.52x = 1,018,729,922.72
5. Step 5: Solve for x
   x = 1,018,729,922.72/52,403.52
6. Step 6: Final answer
   x = 19,440.10