Finding the Fourth Proportional to 69,085.37, 103,629.81 and 51,665.78

Step by Step Solution

1. Step 1: Write the proportion equation
   69,085.37 : 103,629.81 = 51,665.78 : x
2. Step 2: Convert to fraction form
   69,085.37/103,629.81 = 51,665.78/x
3. Step 3: Cross multiply
   69,085.37x = 103,629.81 × 51,665.78
4. Step 4: Simplify right side
   69,085.37x = 5,354,114,964.90
5. Step 5: Solve for x
   x = 5,354,114,964.90/69,085.37
6. Step 6: Final answer
   x = 77,499.98