Finding the Fourth Proportional to 31,007.40, 42,790.20 and 16,860.24

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.40 : 42,790.20 = 16,860.24 : x
2. Step 2: Convert to fraction form
   31,007.40/42,790.20 = 16,860.24/x
3. Step 3: Cross multiply
   31,007.40x = 42,790.20 × 16,860.24
4. Step 4: Simplify right side
   31,007.40x = 721,453,041.65
5. Step 5: Solve for x
   x = 721,453,041.65/31,007.40
6. Step 6: Final answer
   x = 23,267.12