Finding the Fourth Proportional to 78,578.91, 108,438.91 and 42,769.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,578.91 : 108,438.91 = 42,769.18 : x
2. Step 2: Convert to fraction form
   78,578.91/108,438.91 = 42,769.18/x
3. Step 3: Cross multiply
   78,578.91x = 108,438.91 × 42,769.18
4. Step 4: Simplify right side
   78,578.91x = 4,637,843,289.42
5. Step 5: Solve for x
   x = 4,637,843,289.42/78,578.91
6. Step 6: Final answer
   x = 59,021.48