Finding the Fourth Proportional to 78,471, 108,288 and 42,660.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,471 : 108,288 = 42,660.18 : x
2. Step 2: Convert to fraction form
   78,471/108,288 = 42,660.18/x
3. Step 3: Cross multiply
   78,471x = 108,288 × 42,660.18
4. Step 4: Simplify right side
   78,471x = 4,619,585,571.84
5. Step 5: Solve for x
   x = 4,619,585,571.84/78,471
6. Step 6: Final answer
   x = 58,869.97