Finding the Fourth Proportional to 12,120, 18,182.88 and 3,912

Step by Step Solution

1. Step 1: Write the proportion equation
   12,120 : 18,182.88 = 3,912 : x
2. Step 2: Convert to fraction form
   12,120/18,182.88 = 3,912/x
3. Step 3: Cross multiply
   12,120x = 18,182.88 × 3,912
4. Step 4: Simplify right side
   12,120x = 71,131,426.56
5. Step 5: Solve for x
   x = 71,131,426.56/12,120
6. Step 6: Final answer
   x = 5,868.93