Finding the Fourth Proportional to 21,488.26, 32,177.31 and 12,729.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,488.26 : 32,177.31 = 12,729.46 : x
2. Step 2: Convert to fraction form
   21,488.26/32,177.31 = 12,729.46/x
3. Step 3: Cross multiply
   21,488.26x = 32,177.31 × 12,729.46
4. Step 4: Simplify right side
   21,488.26x = 409,599,780.55
5. Step 5: Solve for x
   x = 409,599,780.55/21,488.26
6. Step 6: Final answer
   x = 19,061.56