Finding the Fourth Proportional to 31,073.22, 42,867.38 and 20,997.99

Step by Step Solution

1. Step 1: Write the proportion equation
   31,073.22 : 42,867.38 = 20,997.99 : x
2. Step 2: Convert to fraction form
   31,073.22/42,867.38 = 20,997.99/x
3. Step 3: Cross multiply
   31,073.22x = 42,867.38 × 20,997.99
4. Step 4: Simplify right side
   31,073.22x = 900,128,869.06
5. Step 5: Solve for x
   x = 900,128,869.06/31,073.22
6. Step 6: Final answer
   x = 28,967.99