Finding the Fourth Proportional to 30,970.06, 42,738.72 and 16,822.90

Step by Step Solution

1. Step 1: Write the proportion equation
   30,970.06 : 42,738.72 = 16,822.90 : x
2. Step 2: Convert to fraction form
   30,970.06/42,738.72 = 16,822.90/x
3. Step 3: Cross multiply
   30,970.06x = 42,738.72 × 16,822.90
4. Step 4: Simplify right side
   30,970.06x = 718,989,105.84
5. Step 5: Solve for x
   x = 718,989,105.84/30,970.06
6. Step 6: Final answer
   x = 23,215.62