Finding the Fourth Proportional to 42,460.72, 63,694.32 and 12,880.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,460.72 : 63,694.32 = 12,880.96 : x
2. Step 2: Convert to fraction form
   42,460.72/63,694.32 = 12,880.96/x
3. Step 3: Cross multiply
   42,460.72x = 63,694.32 × 12,880.96
4. Step 4: Simplify right side
   42,460.72x = 820,443,988.15
5. Step 5: Solve for x
   x = 820,443,988.15/42,460.72
6. Step 6: Final answer
   x = 19,322.42