Finding the Fourth Proportional to 30,939.30, 42,696.20 and 16,792.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,939.30 : 42,696.20 = 16,792.15 : x
2. Step 2: Convert to fraction form
   30,939.30/42,696.20 = 16,792.15/x
3. Step 3: Cross multiply
   30,939.30x = 42,696.20 × 16,792.15
4. Step 4: Simplify right side
   30,939.30x = 716,960,994.83
5. Step 5: Solve for x
   x = 716,960,994.83/30,939.30
6. Step 6: Final answer
   x = 23,173.15