Finding the Fourth Proportional to 78,722.88, 108,634.41 and 42,912.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,722.88 : 108,634.41 = 42,912.15 : x
2. Step 2: Convert to fraction form
   78,722.88/108,634.41 = 42,912.15/x
3. Step 3: Cross multiply
   78,722.88x = 108,634.41 × 42,912.15
4. Step 4: Simplify right side
   78,722.88x = 4,661,736,097.08
5. Step 5: Solve for x
   x = 4,661,736,097.08/78,722.88
6. Step 6: Final answer
   x = 59,217.04