Finding the Fourth Proportional to 30,931.81, 42,686.00 and 16,784.65

Step by Step Solution

1. Step 1: Write the proportion equation
   30,931.81 : 42,686.00 = 16,784.65 : x
2. Step 2: Convert to fraction form
   30,931.81/42,686.00 = 16,784.65/x
3. Step 3: Cross multiply
   30,931.81x = 42,686.00 × 16,784.65
4. Step 4: Simplify right side
   30,931.81x = 716,469,696.69
5. Step 5: Solve for x
   x = 716,469,696.69/30,931.81
6. Step 6: Final answer
   x = 23,162.88