Finding the Fourth Proportional to 30,931.84, 42,684.69 and 16,784.38

Step by Step Solution

1. Step 1: Write the proportion equation
   30,931.84 : 42,684.69 = 16,784.38 : x
2. Step 2: Convert to fraction form
   30,931.84/42,684.69 = 16,784.38/x
3. Step 3: Cross multiply
   30,931.84x = 42,684.69 × 16,784.38
4. Step 4: Simplify right side
   30,931.84x = 716,436,057.14
5. Step 5: Solve for x
   x = 716,436,057.14/30,931.84
6. Step 6: Final answer
   x = 23,161.77