Finding the Fourth Proportional to 30,978.48, 42,749.20 and 16,831.04

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.48 : 42,749.20 = 16,831.04 : x
2. Step 2: Convert to fraction form
   30,978.48/42,749.20 = 16,831.04/x
3. Step 3: Cross multiply
   30,978.48x = 42,749.20 × 16,831.04
4. Step 4: Simplify right side
   30,978.48x = 719,513,495.17
5. Step 5: Solve for x
   x = 719,513,495.17/30,978.48
6. Step 6: Final answer
   x = 23,226.24