Finding the Fourth Proportional to 31,131.65, 42,961.82 and 16,984.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,131.65 : 42,961.82 = 16,984.80 : x
2. Step 2: Convert to fraction form
   31,131.65/42,961.82 = 16,984.80/x
3. Step 3: Cross multiply
   31,131.65x = 42,961.82 × 16,984.80
4. Step 4: Simplify right side
   31,131.65x = 729,697,835.41
5. Step 5: Solve for x
   x = 729,697,835.41/31,131.65
6. Step 6: Final answer
   x = 23,439.10