Finding the Fourth Proportional to 14,665.80, 21,987.90 and 9,974.10

Step by Step Solution

1. Step 1: Write the proportion equation
   14,665.80 : 21,987.90 = 9,974.10 : x
2. Step 2: Convert to fraction form
   14,665.80/21,987.90 = 9,974.10/x
3. Step 3: Cross multiply
   14,665.80x = 21,987.90 × 9,974.10
4. Step 4: Simplify right side
   14,665.80x = 219,309,513.39
5. Step 5: Solve for x
   x = 219,309,513.39/14,665.80
6. Step 6: Final answer
   x = 14,953.81