Finding the Fourth Proportional to 12,720.08, 19,081.86 and 4,397.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.08 : 19,081.86 = 4,397.86 : x
2. Step 2: Convert to fraction form
   12,720.08/19,081.86 = 4,397.86/x
3. Step 3: Cross multiply
   12,720.08x = 19,081.86 × 4,397.86
4. Step 4: Simplify right side
   12,720.08x = 83,919,411.89
5. Step 5: Solve for x
   x = 83,919,411.89/12,720.08
6. Step 6: Final answer
   x = 6,597.40