Finding the Fourth Proportional to 31,030.26, 42,771.98 and 20,955.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,030.26 : 42,771.98 = 20,955.48 : x
2. Step 2: Convert to fraction form
   31,030.26/42,771.98 = 20,955.48/x
3. Step 3: Cross multiply
   31,030.26x = 42,771.98 × 20,955.48
4. Step 4: Simplify right side
   31,030.26x = 896,307,371.45
5. Step 5: Solve for x
   x = 896,307,371.45/31,030.26
6. Step 6: Final answer
   x = 28,884.95