Finding the Fourth Proportional to 42,714.39, 64,060.49 and 12,721.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,714.39 : 64,060.49 = 12,721.61 : x
2. Step 2: Convert to fraction form
   42,714.39/64,060.49 = 12,721.61/x
3. Step 3: Cross multiply
   42,714.39x = 64,060.49 × 12,721.61
4. Step 4: Simplify right side
   42,714.39x = 814,952,570.19
5. Step 5: Solve for x
   x = 814,952,570.19/42,714.39
6. Step 6: Final answer
   x = 19,079.11