Finding the Fourth Proportional to 30,917.18, 42,661.83 and 18,339.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,917.18 : 42,661.83 = 18,339.50 : x
2. Step 2: Convert to fraction form
   30,917.18/42,661.83 = 18,339.50/x
3. Step 3: Cross multiply
   30,917.18x = 42,661.83 × 18,339.50
4. Step 4: Simplify right side
   30,917.18x = 782,396,631.29
5. Step 5: Solve for x
   x = 782,396,631.29/30,917.18
6. Step 6: Final answer
   x = 25,306.21