Finding the Fourth Proportional to 42,481, 63,714.32 and 12,891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,481 : 63,714.32 = 12,891.72 : x
2. Step 2: Convert to fraction form
   42,481/63,714.32 = 12,891.72/x
3. Step 3: Cross multiply
   42,481x = 63,714.32 × 12,891.72
4. Step 4: Simplify right side
   42,481x = 821,387,173.43
5. Step 5: Solve for x
   x = 821,387,173.43/42,481
6. Step 6: Final answer
   x = 19,335.40