Finding the Fourth Proportional to 31,015.23, 42,801.09 and 16,868.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,015.23 : 42,801.09 = 16,868.10 : x
2. Step 2: Convert to fraction form
   31,015.23/42,801.09 = 16,868.10/x
3. Step 3: Cross multiply
   31,015.23x = 42,801.09 × 16,868.10
4. Step 4: Simplify right side
   31,015.23x = 721,973,066.23
5. Step 5: Solve for x
   x = 721,973,066.23/31,015.23
6. Step 6: Final answer
   x = 23,278.02