Finding the Fourth Proportional to 30,928.17, 42,679.73 and 16,780.71

Step by Step Solution

1. Step 1: Write the proportion equation
   30,928.17 : 42,679.73 = 16,780.71 : x
2. Step 2: Convert to fraction form
   30,928.17/42,679.73 = 16,780.71/x
3. Step 3: Cross multiply
   30,928.17x = 42,679.73 × 16,780.71
4. Step 4: Simplify right side
   30,928.17x = 716,196,172.01
5. Step 5: Solve for x
   x = 716,196,172.01/30,928.17
6. Step 6: Final answer
   x = 23,156.76