Finding the Fourth Proportional to 12,430.67, 18,649.32 and 5,412.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,430.67 : 18,649.32 = 5,412.18 : x
2. Step 2: Convert to fraction form
   12,430.67/18,649.32 = 5,412.18/x
3. Step 3: Cross multiply
   12,430.67x = 18,649.32 × 5,412.18
4. Step 4: Simplify right side
   12,430.67x = 100,933,476.72
5. Step 5: Solve for x
   x = 100,933,476.72/12,430.67
6. Step 6: Final answer
   x = 8,119.72