Finding the Fourth Proportional to 9,986.56, 14,979.82 and 3,412.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.56 : 14,979.82 = 3,412.80 : x
2. Step 2: Convert to fraction form
   9,986.56/14,979.82 = 3,412.80/x
3. Step 3: Cross multiply
   9,986.56x = 14,979.82 × 3,412.80
4. Step 4: Simplify right side
   9,986.56x = 51,123,129.70
5. Step 5: Solve for x
   x = 51,123,129.70/9,986.56
6. Step 6: Final answer
   x = 5,119.19