Finding the Fourth Proportional to 30,931.46, 42,686.24 and 16,784.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,931.46 : 42,686.24 = 16,784.31 : x
2. Step 2: Convert to fraction form
   30,931.46/42,686.24 = 16,784.31/x
3. Step 3: Cross multiply
   30,931.46x = 42,686.24 × 16,784.31
4. Step 4: Simplify right side
   30,931.46x = 716,459,000.97
5. Step 5: Solve for x
   x = 716,459,000.97/30,931.46
6. Step 6: Final answer
   x = 23,162.80