Finding the Fourth Proportional to 42,831.64, 64,210.50 and 20,614.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,831.64 : 64,210.50 = 20,614.42 : x
2. Step 2: Convert to fraction form
   42,831.64/64,210.50 = 20,614.42/x
3. Step 3: Cross multiply
   42,831.64x = 64,210.50 × 20,614.42
4. Step 4: Simplify right side
   42,831.64x = 1,323,662,215.41
5. Step 5: Solve for x
   x = 1,323,662,215.41/42,831.64
6. Step 6: Final answer
   x = 30,903.84