Finding the Fourth Proportional to 42,543.68, 63,824.72 and 12,960.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,543.68 : 63,824.72 = 12,960.72 : x
2. Step 2: Convert to fraction form
   42,543.68/63,824.72 = 12,960.72/x
3. Step 3: Cross multiply
   42,543.68x = 63,824.72 × 12,960.72
4. Step 4: Simplify right side
   42,543.68x = 827,214,260.19
5. Step 5: Solve for x
   x = 827,214,260.19/42,543.68
6. Step 6: Final answer
   x = 19,443.88