Finding the Fourth Proportional to 12,109.73, 18,111.47 and 10,784.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.73 : 18,111.47 = 10,784.87 : x
2. Step 2: Convert to fraction form
   12,109.73/18,111.47 = 10,784.87/x
3. Step 3: Cross multiply
   12,109.73x = 18,111.47 × 10,784.87
4. Step 4: Simplify right side
   12,109.73x = 195,329,849.46
5. Step 5: Solve for x
   x = 195,329,849.46/12,109.73
6. Step 6: Final answer
   x = 16,129.99