Finding the Fourth Proportional to 10,478.19, 15,718.38 and 3,456.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,478.19 : 15,718.38 = 3,456.15 : x
2. Step 2: Convert to fraction form
   10,478.19/15,718.38 = 3,456.15/x
3. Step 3: Cross multiply
   10,478.19x = 15,718.38 × 3,456.15
4. Step 4: Simplify right side
   10,478.19x = 54,325,079.04
5. Step 5: Solve for x
   x = 54,325,079.04/10,478.19
6. Step 6: Final answer
   x = 5,184.59