Finding the Fourth Proportional to 78,428.43, 108,231.91 and 42,618.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,428.43 : 108,231.91 = 42,618.42 : x
2. Step 2: Convert to fraction form
   78,428.43/108,231.91 = 42,618.42/x
3. Step 3: Cross multiply
   78,428.43x = 108,231.91 × 42,618.42
4. Step 4: Simplify right side
   78,428.43x = 4,612,672,891.24
5. Step 5: Solve for x
   x = 4,612,672,891.24/78,428.43
6. Step 6: Final answer
   x = 58,813.79