Finding the Fourth Proportional to 42,540.24, 63,813.06 and 12,960.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,540.24 : 63,813.06 = 12,960.12 : x
2. Step 2: Convert to fraction form
   42,540.24/63,813.06 = 12,960.12/x
3. Step 3: Cross multiply
   42,540.24x = 63,813.06 × 12,960.12
4. Step 4: Simplify right side
   42,540.24x = 827,024,915.17
5. Step 5: Solve for x
   x = 827,024,915.17/42,540.24
6. Step 6: Final answer
   x = 19,441.00