Finding the Fourth Proportional to 1,346.31, 1,857.57 and 1,031.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.31 : 1,857.57 = 1,031.90 : x
2. Step 2: Convert to fraction form
   1,346.31/1,857.57 = 1,031.90/x
3. Step 3: Cross multiply
   1,346.31x = 1,857.57 × 1,031.90
4. Step 4: Simplify right side
   1,346.31x = 1,916,817.20
5. Step 5: Solve for x
   x = 1,916,817.20/1,346.31
6. Step 6: Final answer
   x = 1,423.76