Finding the Fourth Proportional to 78,720.48, 108,635.99 and 42,912.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78,720.48 : 108,635.99 = 42,912.27 : x
2. Step 2: Convert to fraction form
   78,720.48/108,635.99 = 42,912.27/x
3. Step 3: Cross multiply
   78,720.48x = 108,635.99 × 42,912.27
4. Step 4: Simplify right side
   78,720.48x = 4,661,816,720.04
5. Step 5: Solve for x
   x = 4,661,816,720.04/78,720.48
6. Step 6: Final answer
   x = 59,219.87