Finding the Fourth Proportional to 30,785.69, 42,484.19 and 16,638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,785.69 : 42,484.19 = 16,638.50 : x
2. Step 2: Convert to fraction form
   30,785.69/42,484.19 = 16,638.50/x
3. Step 3: Cross multiply
   30,785.69x = 42,484.19 × 16,638.50
4. Step 4: Simplify right side
   30,785.69x = 706,873,153.72
5. Step 5: Solve for x
   x = 706,873,153.72/30,785.69
6. Step 6: Final answer
   x = 22,961.10