Finding the Fourth Proportional to 1,556.31, 2,147.46 and 997.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.31 : 2,147.46 = 997.29 : x
2. Step 2: Convert to fraction form
   1,556.31/2,147.46 = 997.29/x
3. Step 3: Cross multiply
   1,556.31x = 2,147.46 × 997.29
4. Step 4: Simplify right side
   1,556.31x = 2,141,640.38
5. Step 5: Solve for x
   x = 2,141,640.38/1,556.31
6. Step 6: Final answer
   x = 1,376.10