Finding the Fourth Proportional to 139,847.78, 209,584.82 and 51,017.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,847.78 : 209,584.82 = 51,017.78 : x
2. Step 2: Convert to fraction form
   139,847.78/209,584.82 = 51,017.78/x
3. Step 3: Cross multiply
   139,847.78x = 209,584.82 × 51,017.78
4. Step 4: Simplify right side
   139,847.78x = 10,692,552,238.10
5. Step 5: Solve for x
   x = 10,692,552,238.10/139,847.78
6. Step 6: Final answer
   x = 76,458.51