Finding the Fourth Proportional to 30,520.29, 42,120.09 and 17,091.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,520.29 : 42,120.09 = 17,091.18 : x
2. Step 2: Convert to fraction form
   30,520.29/42,120.09 = 17,091.18/x
3. Step 3: Cross multiply
   30,520.29x = 42,120.09 × 17,091.18
4. Step 4: Simplify right side
   30,520.29x = 719,882,039.81
5. Step 5: Solve for x
   x = 719,882,039.81/30,520.29
6. Step 6: Final answer
   x = 23,587.00