Finding the Fourth Proportional to 8,939.34, 12,345.72 and 5,589.99

Step by Step Solution

1. Step 1: Write the proportion equation
   8,939.34 : 12,345.72 = 5,589.99 : x
2. Step 2: Convert to fraction form
   8,939.34/12,345.72 = 5,589.99/x
3. Step 3: Cross multiply
   8,939.34x = 12,345.72 × 5,589.99
4. Step 4: Simplify right side
   8,939.34x = 69,012,451.34
5. Step 5: Solve for x
   x = 69,012,451.34/8,939.34
6. Step 6: Final answer
   x = 7,720.08