Finding the Fourth Proportional to 83,505.78, 115,238.34 and 49,971.78

Step by Step Solution

1. Step 1: Write the proportion equation
   83,505.78 : 115,238.34 = 49,971.78 : x
2. Step 2: Convert to fraction form
   83,505.78/115,238.34 = 49,971.78/x
3. Step 3: Cross multiply
   83,505.78x = 115,238.34 × 49,971.78
4. Step 4: Simplify right side
   83,505.78x = 5,758,664,974.05
5. Step 5: Solve for x
   x = 5,758,664,974.05/83,505.78
6. Step 6: Final answer
   x = 68,961.27