Finding the Fourth Proportional to 12,658.86, 18,990.72 and 3,892.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.86 : 18,990.72 = 3,892.23 : x
2. Step 2: Convert to fraction form
   12,658.86/18,990.72 = 3,892.23/x
3. Step 3: Cross multiply
   12,658.86x = 18,990.72 × 3,892.23
4. Step 4: Simplify right side
   12,658.86x = 73,916,250.11
5. Step 5: Solve for x
   x = 73,916,250.11/12,658.86
6. Step 6: Final answer
   x = 5,839.09