Finding the Fourth Proportional to 30,967.87, 42,735.72 and 16,820.68

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.87 : 42,735.72 = 16,820.68 : x
2. Step 2: Convert to fraction form
   30,967.87/42,735.72 = 16,820.68/x
3. Step 3: Cross multiply
   30,967.87x = 42,735.72 × 16,820.68
4. Step 4: Simplify right side
   30,967.87x = 718,843,870.69
5. Step 5: Solve for x
   x = 718,843,870.69/30,967.87
6. Step 6: Final answer
   x = 23,212.57