Finding the Fourth Proportional to 78,428.92, 108,231.69 and 42,618.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,428.92 : 108,231.69 = 42,618.94 : x
2. Step 2: Convert to fraction form
   78,428.92/108,231.69 = 42,618.94/x
3. Step 3: Cross multiply
   78,428.92x = 108,231.69 × 42,618.94
4. Step 4: Simplify right side
   78,428.92x = 4,612,719,902.21
5. Step 5: Solve for x
   x = 4,612,719,902.21/78,428.92
6. Step 6: Final answer
   x = 58,814.02