Finding the Fourth Proportional to 16,406.72, 22,640.34 and 9,690.81

Step by Step Solution

1. Step 1: Write the proportion equation
   16,406.72 : 22,640.34 = 9,690.81 : x
2. Step 2: Convert to fraction form
   16,406.72/22,640.34 = 9,690.81/x
3. Step 3: Cross multiply
   16,406.72x = 22,640.34 × 9,690.81
4. Step 4: Simplify right side
   16,406.72x = 219,403,184.71
5. Step 5: Solve for x
   x = 219,403,184.71/16,406.72
6. Step 6: Final answer
   x = 13,372.76