Finding the Fourth Proportional to 2,629.86, 3,942.71 and 1,312.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.86 : 3,942.71 = 1,312.94 : x
2. Step 2: Convert to fraction form
   2,629.86/3,942.71 = 1,312.94/x
3. Step 3: Cross multiply
   2,629.86x = 3,942.71 × 1,312.94
4. Step 4: Simplify right side
   2,629.86x = 5,176,525.24
5. Step 5: Solve for x
   x = 5,176,525.24/2,629.86
6. Step 6: Final answer
   x = 1,968.37