Finding the Fourth Proportional to 69,091.37, 103,638.81 and 51,671.78

Step by Step Solution

1. Step 1: Write the proportion equation
   69,091.37 : 103,638.81 = 51,671.78 : x
2. Step 2: Convert to fraction form
   69,091.37/103,638.81 = 51,671.78/x
3. Step 3: Cross multiply
   69,091.37x = 103,638.81 × 51,671.78
4. Step 4: Simplify right side
   69,091.37x = 5,355,201,789.78
5. Step 5: Solve for x
   x = 5,355,201,789.78/69,091.37
6. Step 6: Final answer
   x = 77,508.98