Finding the Fourth Proportional to 30,978.71, 42,751.50 and 16,832.42

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.71 : 42,751.50 = 16,832.42 : x
2. Step 2: Convert to fraction form
   30,978.71/42,751.50 = 16,832.42/x
3. Step 3: Cross multiply
   30,978.71x = 42,751.50 × 16,832.42
4. Step 4: Simplify right side
   30,978.71x = 719,611,203.63
5. Step 5: Solve for x
   x = 719,611,203.63/30,978.71
6. Step 6: Final answer
   x = 23,229.22