Finding the Fourth Proportional to 10,200.91, 15,286.99 and 8,111.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,200.91 : 15,286.99 = 8,111.64 : x
2. Step 2: Convert to fraction form
   10,200.91/15,286.99 = 8,111.64/x
3. Step 3: Cross multiply
   10,200.91x = 15,286.99 × 8,111.64
4. Step 4: Simplify right side
   10,200.91x = 124,002,559.56
5. Step 5: Solve for x
   x = 124,002,559.56/10,200.91
6. Step 6: Final answer
   x = 12,156.03