Finding the Fourth Proportional to 76,790.80, 105,979.89 and 42,802.39

Step by Step Solution

1. Step 1: Write the proportion equation
   76,790.80 : 105,979.89 = 42,802.39 : x
2. Step 2: Convert to fraction form
   76,790.80/105,979.89 = 42,802.39/x
3. Step 3: Cross multiply
   76,790.80x = 105,979.89 × 42,802.39
4. Step 4: Simplify right side
   76,790.80x = 4,536,192,583.94
5. Step 5: Solve for x
   x = 4,536,192,583.94/76,790.80
6. Step 6: Final answer
   x = 59,072.08