Finding the Fourth Proportional to 16,981.71, 23,434.65 and 9,428.10

Step by Step Solution

1. Step 1: Write the proportion equation
   16,981.71 : 23,434.65 = 9,428.10 : x
2. Step 2: Convert to fraction form
   16,981.71/23,434.65 = 9,428.10/x
3. Step 3: Cross multiply
   16,981.71x = 23,434.65 × 9,428.10
4. Step 4: Simplify right side
   16,981.71x = 220,944,223.67
5. Step 5: Solve for x
   x = 220,944,223.67/16,981.71
6. Step 6: Final answer
   x = 13,010.72