Finding the Fourth Proportional to 2,163.34, 2,985.41 and 1,312.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,163.34 : 2,985.41 = 1,312.31 : x
2. Step 2: Convert to fraction form
   2,163.34/2,985.41 = 1,312.31/x
3. Step 3: Cross multiply
   2,163.34x = 2,985.41 × 1,312.31
4. Step 4: Simplify right side
   2,163.34x = 3,917,768.47
5. Step 5: Solve for x
   x = 3,917,768.47/2,163.34
6. Step 6: Final answer
   x = 1,810.99