Finding the Fourth Proportional to 13,612.86, 20,410.56 and 5,720.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,612.86 : 20,410.56 = 5,720.49 : x
2. Step 2: Convert to fraction form
   13,612.86/20,410.56 = 5,720.49/x
3. Step 3: Cross multiply
   13,612.86x = 20,410.56 × 5,720.49
4. Step 4: Simplify right side
   13,612.86x = 116,758,404.37
5. Step 5: Solve for x
   x = 116,758,404.37/13,612.86
6. Step 6: Final answer
   x = 8,577.07