Finding the Fourth Proportional to 30,785.72, 42,484.23 and 16,638.53

Step by Step Solution

1. Step 1: Write the proportion equation
   30,785.72 : 42,484.23 = 16,638.53 : x
2. Step 2: Convert to fraction form
   30,785.72/42,484.23 = 16,638.53/x
3. Step 3: Cross multiply
   30,785.72x = 42,484.23 × 16,638.53
4. Step 4: Simplify right side
   30,785.72x = 706,874,922.96
5. Step 5: Solve for x
   x = 706,874,922.96/30,785.72
6. Step 6: Final answer
   x = 22,961.13