Finding the Fourth Proportional to 20,372.76, 28,114.37 and 12,415

Step by Step Solution

1. Step 1: Write the proportion equation
   20,372.76 : 28,114.37 = 12,415 : x
2. Step 2: Convert to fraction form
   20,372.76/28,114.37 = 12,415/x
3. Step 3: Cross multiply
   20,372.76x = 28,114.37 × 12,415
4. Step 4: Simplify right side
   20,372.76x = 349,039,903.55
5. Step 5: Solve for x
   x = 349,039,903.55/20,372.76
6. Step 6: Final answer
   x = 17,132.68