Finding the Fourth Proportional to 8,686.59, 13,037.72 and 5,406.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,686.59 : 13,037.72 = 5,406.09 : x
2. Step 2: Convert to fraction form
   8,686.59/13,037.72 = 5,406.09/x
3. Step 3: Cross multiply
   8,686.59x = 13,037.72 × 5,406.09
4. Step 4: Simplify right side
   8,686.59x = 70,483,060.68
5. Step 5: Solve for x
   x = 70,483,060.68/8,686.59
6. Step 6: Final answer
   x = 8,114.01