Finding the Fourth Proportional to 30,978.30, 42,750.11 and 16,831.16

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.30 : 42,750.11 = 16,831.16 : x
2. Step 2: Convert to fraction form
   30,978.30/42,750.11 = 16,831.16/x
3. Step 3: Cross multiply
   30,978.30x = 42,750.11 × 16,831.16
4. Step 4: Simplify right side
   30,978.30x = 719,533,941.43
5. Step 5: Solve for x
   x = 719,533,941.43/30,978.30
6. Step 6: Final answer
   x = 23,227.03