Finding the Fourth Proportional to 78,039.45, 117,091.58 and 49,991.13

Step by Step Solution

1. Step 1: Write the proportion equation
   78,039.45 : 117,091.58 = 49,991.13 : x
2. Step 2: Convert to fraction form
   78,039.45/117,091.58 = 49,991.13/x
3. Step 3: Cross multiply
   78,039.45x = 117,091.58 × 49,991.13
4. Step 4: Simplify right side
   78,039.45x = 5,853,540,147.73
5. Step 5: Solve for x
   x = 5,853,540,147.73/78,039.45
6. Step 6: Final answer
   x = 75,007.45