Finding the Fourth Proportional to 78,636.21, 108,519.93 and 42,828.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,636.21 : 108,519.93 = 42,828.18 : x
2. Step 2: Convert to fraction form
   78,636.21/108,519.93 = 42,828.18/x
3. Step 3: Cross multiply
   78,636.21x = 108,519.93 × 42,828.18
4. Step 4: Simplify right side
   78,636.21x = 4,647,711,095.63
5. Step 5: Solve for x
   x = 4,647,711,095.63/78,636.21
6. Step 6: Final answer
   x = 59,103.96