Finding the Fourth Proportional to 78,569.91, 108,423.99 and 42,759

Step by Step Solution

1. Step 1: Write the proportion equation
   78,569.91 : 108,423.99 = 42,759 : x
2. Step 2: Convert to fraction form
   78,569.91/108,423.99 = 42,759/x
3. Step 3: Cross multiply
   78,569.91x = 108,423.99 × 42,759
4. Step 4: Simplify right side
   78,569.91x = 4,636,101,388.41
5. Step 5: Solve for x
   x = 4,636,101,388.41/78,569.91
6. Step 6: Final answer
   x = 59,006.07