Finding the Fourth Proportional to 30,790.47, 42,490.82 and 16,643.32

Step by Step Solution

1. Step 1: Write the proportion equation
   30,790.47 : 42,490.82 = 16,643.32 : x
2. Step 2: Convert to fraction form
   30,790.47/42,490.82 = 16,643.32/x
3. Step 3: Cross multiply
   30,790.47x = 42,490.82 × 16,643.32
4. Step 4: Simplify right side
   30,790.47x = 707,188,249.70
5. Step 5: Solve for x
   x = 707,188,249.70/30,790.47
6. Step 6: Final answer
   x = 22,967.76