Finding the Fourth Proportional to 8,591.72, 12,889.19 and 3,398.00

Step by Step Solution

1. Step 1: Write the proportion equation
   8,591.72 : 12,889.19 = 3,398.00 : x
2. Step 2: Convert to fraction form
   8,591.72/12,889.19 = 3,398.00/x
3. Step 3: Cross multiply
   8,591.72x = 12,889.19 × 3,398.00
4. Step 4: Simplify right side
   8,591.72x = 43,797,411.67
5. Step 5: Solve for x
   x = 43,797,411.67/8,591.72
6. Step 6: Final answer
   x = 5,097.63