Finding the Fourth Proportional to 16,131.02, 22,256.90 and 9,412.80

Step by Step Solution

1. Step 1: Write the proportion equation
   16,131.02 : 22,256.90 = 9,412.80 : x
2. Step 2: Convert to fraction form
   16,131.02/22,256.90 = 9,412.80/x
3. Step 3: Cross multiply
   16,131.02x = 22,256.90 × 9,412.80
4. Step 4: Simplify right side
   16,131.02x = 209,499,748.32
5. Step 5: Solve for x
   x = 209,499,748.32/16,131.02
6. Step 6: Final answer
   x = 12,987.38