Finding the Fourth Proportional to 21,256.38, 31,868.70 and 14,663.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,256.38 : 31,868.70 = 14,663.76 : x
2. Step 2: Convert to fraction form
   21,256.38/31,868.70 = 14,663.76/x
3. Step 3: Cross multiply
   21,256.38x = 31,868.70 × 14,663.76
4. Step 4: Simplify right side
   21,256.38x = 467,314,968.31
5. Step 5: Solve for x
   x = 467,314,968.31/21,256.38
6. Step 6: Final answer
   x = 21,984.69