Finding the Fourth Proportional to 10,460.72, 15,671.29 and 8,109.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,460.72 : 15,671.29 = 8,109.20 : x
2. Step 2: Convert to fraction form
   10,460.72/15,671.29 = 8,109.20/x
3. Step 3: Cross multiply
   10,460.72x = 15,671.29 × 8,109.20
4. Step 4: Simplify right side
   10,460.72x = 127,081,654.05
5. Step 5: Solve for x
   x = 127,081,654.05/10,460.72
6. Step 6: Final answer
   x = 12,148.46