Finding the Fourth Proportional to 12,111.98, 16,719.18 and 10,850.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.98 : 16,719.18 = 10,850.90 : x
2. Step 2: Convert to fraction form
   12,111.98/16,719.18 = 10,850.90/x
3. Step 3: Cross multiply
   12,111.98x = 16,719.18 × 10,850.90
4. Step 4: Simplify right side
   12,111.98x = 181,418,150.26
5. Step 5: Solve for x
   x = 181,418,150.26/12,111.98
6. Step 6: Final answer
   x = 14,978.41