Finding the Fourth Proportional to 19,971.88, 29,931.72 and 14,443.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,971.88 : 29,931.72 = 14,443.72 : x
2. Step 2: Convert to fraction form
   19,971.88/29,931.72 = 14,443.72/x
3. Step 3: Cross multiply
   19,971.88x = 29,931.72 × 14,443.72
4. Step 4: Simplify right side
   19,971.88x = 432,325,382.80
5. Step 5: Solve for x
   x = 432,325,382.80/19,971.88
6. Step 6: Final answer
   x = 21,646.70