Finding the Fourth Proportional to 30,967.31, 42,734.99 and 20,375.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.31 : 42,734.99 = 20,375.96 : x
2. Step 2: Convert to fraction form
   30,967.31/42,734.99 = 20,375.96/x
3. Step 3: Cross multiply
   30,967.31x = 42,734.99 × 20,375.96
4. Step 4: Simplify right side
   30,967.31x = 870,766,284.11
5. Step 5: Solve for x
   x = 870,766,284.11/30,967.31
6. Step 6: Final answer
   x = 28,118.88