Finding the Fourth Proportional to 21,531.89, 29,700.59 and 14,805.85

Step by Step Solution

1. Step 1: Write the proportion equation
   21,531.89 : 29,700.59 = 14,805.85 : x
2. Step 2: Convert to fraction form
   21,531.89/29,700.59 = 14,805.85/x
3. Step 3: Cross multiply
   21,531.89x = 29,700.59 × 14,805.85
4. Step 4: Simplify right side
   21,531.89x = 439,742,443.21
5. Step 5: Solve for x
   x = 439,742,443.21/21,531.89
6. Step 6: Final answer
   x = 20,422.85