Finding the Fourth Proportional to 21,144.32, 31,736.16 and 10,763.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.32 : 31,736.16 = 10,763.84 : x
2. Step 2: Convert to fraction form
   21,144.32/31,736.16 = 10,763.84/x
3. Step 3: Cross multiply
   21,144.32x = 31,736.16 × 10,763.84
4. Step 4: Simplify right side
   21,144.32x = 341,602,948.45
5. Step 5: Solve for x
   x = 341,602,948.45/21,144.32
6. Step 6: Final answer
   x = 16,155.78