Finding the Fourth Proportional to 30,530.15, 42,128.32 and 16,917.80

Step by Step Solution

1. Step 1: Write the proportion equation
   30,530.15 : 42,128.32 = 16,917.80 : x
2. Step 2: Convert to fraction form
   30,530.15/42,128.32 = 16,917.80/x
3. Step 3: Cross multiply
   30,530.15x = 42,128.32 × 16,917.80
4. Step 4: Simplify right side
   30,530.15x = 712,718,492.10
5. Step 5: Solve for x
   x = 712,718,492.10/30,530.15
6. Step 6: Final answer
   x = 23,344.74