Finding the Fourth Proportional to 31,015.23, 42,801.12 and 16,868.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,015.23 : 42,801.12 = 16,868.13 : x
2. Step 2: Convert to fraction form
   31,015.23/42,801.12 = 16,868.13/x
3. Step 3: Cross multiply
   31,015.23x = 42,801.12 × 16,868.13
4. Step 4: Simplify right side
   31,015.23x = 721,974,856.31
5. Step 5: Solve for x
   x = 721,974,856.31/31,015.23
6. Step 6: Final answer
   x = 23,278.08