Finding the Fourth Proportional to 22,940.50, 31,667.60 and 13,991.21

Step by Step Solution

1. Step 1: Write the proportion equation
   22,940.50 : 31,667.60 = 13,991.21 : x
2. Step 2: Convert to fraction form
   22,940.50/31,667.60 = 13,991.21/x
3. Step 3: Cross multiply
   22,940.50x = 31,667.60 × 13,991.21
4. Step 4: Simplify right side
   22,940.50x = 443,068,041.80
5. Step 5: Solve for x
   x = 443,068,041.80/22,940.50
6. Step 6: Final answer
   x = 19,313.79