Finding the Fourth Proportional to 12,657.83, 17,456.13 and 7,871.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,657.83 : 17,456.13 = 7,871.63 : x
2. Step 2: Convert to fraction form
   12,657.83/17,456.13 = 7,871.63/x
3. Step 3: Cross multiply
   12,657.83x = 17,456.13 × 7,871.63
4. Step 4: Simplify right side
   12,657.83x = 137,408,109.31
5. Step 5: Solve for x
   x = 137,408,109.31/12,657.83
6. Step 6: Final answer
   x = 10,855.59