Finding the Fourth Proportional to 13,580.72, 20,380.12 and 5,582.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,580.72 : 20,380.12 = 5,582.05 : x
2. Step 2: Convert to fraction form
   13,580.72/20,380.12 = 5,582.05/x
3. Step 3: Cross multiply
   13,580.72x = 20,380.12 × 5,582.05
4. Step 4: Simplify right side
   13,580.72x = 113,762,848.85
5. Step 5: Solve for x
   x = 113,762,848.85/13,580.72
6. Step 6: Final answer
   x = 8,376.79