Finding the Fourth Proportional to 76,778.73, 105,906.15 and 52,863.87

Step by Step Solution

1. Step 1: Write the proportion equation
   76,778.73 : 105,906.15 = 52,863.87 : x
2. Step 2: Convert to fraction form
   76,778.73/105,906.15 = 52,863.87/x
3. Step 3: Cross multiply
   76,778.73x = 105,906.15 × 52,863.87
4. Step 4: Simplify right side
   76,778.73x = 5,598,608,945.80
5. Step 5: Solve for x
   x = 5,598,608,945.80/76,778.73
6. Step 6: Final answer
   x = 72,918.75