Finding the Fourth Proportional to 30,789.15, 42,489.05 and 16,642.01

Step by Step Solution

1. Step 1: Write the proportion equation
   30,789.15 : 42,489.05 = 16,642.01 : x
2. Step 2: Convert to fraction form
   30,789.15/42,489.05 = 16,642.01/x
3. Step 3: Cross multiply
   30,789.15x = 42,489.05 × 16,642.01
4. Step 4: Simplify right side
   30,789.15x = 707,102,899.34
5. Step 5: Solve for x
   x = 707,102,899.34/30,789.15
6. Step 6: Final answer
   x = 22,965.98