Finding the Fourth Proportional to 3,911.31, 5,863.29 and 1,312.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.31 : 5,863.29 = 1,312.43 : x
2. Step 2: Convert to fraction form
   3,911.31/5,863.29 = 1,312.43/x
3. Step 3: Cross multiply
   3,911.31x = 5,863.29 × 1,312.43
4. Step 4: Simplify right side
   3,911.31x = 7,695,128.38
5. Step 5: Solve for x
   x = 7,695,128.38/3,911.31
6. Step 6: Final answer
   x = 1,967.40