Finding the Fourth Proportional to 31,055.41, 42,884.91 and 19,728.55

Step by Step Solution

1. Step 1: Write the proportion equation
   31,055.41 : 42,884.91 = 19,728.55 : x
2. Step 2: Convert to fraction form
   31,055.41/42,884.91 = 19,728.55/x
3. Step 3: Cross multiply
   31,055.41x = 42,884.91 × 19,728.55
4. Step 4: Simplify right side
   31,055.41x = 846,057,091.18
5. Step 5: Solve for x
   x = 846,057,091.18/31,055.41
6. Step 6: Final answer
   x = 27,243.47