Finding the Fourth Proportional to 42,543.09, 63,823.86 and 12,960.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,543.09 : 63,823.86 = 12,960.15 : x
2. Step 2: Convert to fraction form
   42,543.09/63,823.86 = 12,960.15/x
3. Step 3: Cross multiply
   42,543.09x = 63,823.86 × 12,960.15
4. Step 4: Simplify right side
   42,543.09x = 827,166,799.18
5. Step 5: Solve for x
   x = 827,166,799.18/42,543.09
6. Step 6: Final answer
   x = 19,443.04