Finding the Fourth Proportional to 33,131.68, 45,731.99 and 20,388.76

Step by Step Solution

1. Step 1: Write the proportion equation
   33,131.68 : 45,731.99 = 20,388.76 : x
2. Step 2: Convert to fraction form
   33,131.68/45,731.99 = 20,388.76/x
3. Step 3: Cross multiply
   33,131.68x = 45,731.99 × 20,388.76
4. Step 4: Simplify right side
   33,131.68x = 932,418,568.43
5. Step 5: Solve for x
   x = 932,418,568.43/33,131.68
6. Step 6: Final answer
   x = 28,142.81