Finding the Fourth Proportional to 12,111.66, 16,696.80 and 9,426.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.66 : 16,696.80 = 9,426.51 : x
2. Step 2: Convert to fraction form
   12,111.66/16,696.80 = 9,426.51/x
3. Step 3: Cross multiply
   12,111.66x = 16,696.80 × 9,426.51
4. Step 4: Simplify right side
   12,111.66x = 157,392,552.17
5. Step 5: Solve for x
   x = 157,392,552.17/12,111.66
6. Step 6: Final answer
   x = 12,995.13