Finding the Fourth Proportional to 10,781.91, 16,173.98 and 2,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,781.91 : 16,173.98 = 2,990.72 : x
2. Step 2: Convert to fraction form
   10,781.91/16,173.98 = 2,990.72/x
3. Step 3: Cross multiply
   10,781.91x = 16,173.98 × 2,990.72
4. Step 4: Simplify right side
   10,781.91x = 48,371,882.16
5. Step 5: Solve for x
   x = 48,371,882.16/10,781.91
6. Step 6: Final answer
   x = 4,486.39