Finding the Fourth Proportional to 10,525.47, 15,786.72 and 4,288.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,525.47 : 15,786.72 = 4,288.20 : x
2. Step 2: Convert to fraction form
   10,525.47/15,786.72 = 4,288.20/x
3. Step 3: Cross multiply
   10,525.47x = 15,786.72 × 4,288.20
4. Step 4: Simplify right side
   10,525.47x = 67,696,612.70
5. Step 5: Solve for x
   x = 67,696,612.70/10,525.47
6. Step 6: Final answer
   x = 6,431.69