Finding the Fourth Proportional to 8,415.31, 12,609.01 and 5,118.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,415.31 : 12,609.01 = 5,118.43 : x
2. Step 2: Convert to fraction form
   8,415.31/12,609.01 = 5,118.43/x
3. Step 3: Cross multiply
   8,415.31x = 12,609.01 × 5,118.43
4. Step 4: Simplify right side
   8,415.31x = 64,538,335.05
5. Step 5: Solve for x
   x = 64,538,335.05/8,415.31
6. Step 6: Final answer
   x = 7,669.16