Finding the Fourth Proportional to 31,069.72, 42,846.26 and 20,883.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.72 : 42,846.26 = 20,883.72 : x
2. Step 2: Convert to fraction form
   31,069.72/42,846.26 = 20,883.72/x
3. Step 3: Cross multiply
   31,069.72x = 42,846.26 × 20,883.72
4. Step 4: Simplify right side
   31,069.72x = 894,789,296.89
5. Step 5: Solve for x
   x = 894,789,296.89/31,069.72
6. Step 6: Final answer
   x = 28,799.40