Finding the Fourth Proportional to 31,068.28, 42,874.28 and 16,921.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.28 : 42,874.28 = 16,921.18 : x
2. Step 2: Convert to fraction form
   31,068.28/42,874.28 = 16,921.18/x
3. Step 3: Cross multiply
   31,068.28x = 42,874.28 × 16,921.18
4. Step 4: Simplify right side
   31,068.28x = 725,483,409.25
5. Step 5: Solve for x
   x = 725,483,409.25/31,068.28
6. Step 6: Final answer
   x = 23,351.26