Finding the Fourth Proportional to 30,978.64, 42,751.16 and 16,832.40

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.64 : 42,751.16 = 16,832.40 : x
2. Step 2: Convert to fraction form
   30,978.64/42,751.16 = 16,832.40/x
3. Step 3: Cross multiply
   30,978.64x = 42,751.16 × 16,832.40
4. Step 4: Simplify right side
   30,978.64x = 719,604,625.58
5. Step 5: Solve for x
   x = 719,604,625.58/30,978.64
6. Step 6: Final answer
   x = 23,229.06