Finding the Fourth Proportional to 31,068.39, 42,874.38 and 16,921.23

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.39 : 42,874.38 = 16,921.23 : x
2. Step 2: Convert to fraction form
   31,068.39/42,874.38 = 16,921.23/x
3. Step 3: Cross multiply
   31,068.39x = 42,874.38 × 16,921.23
4. Step 4: Simplify right side
   31,068.39x = 725,487,245.09
5. Step 5: Solve for x
   x = 725,487,245.09/31,068.39
6. Step 6: Final answer
   x = 23,351.30