Finding the Fourth Proportional to 1,576.31, 2,174.58 and 985.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,576.31 : 2,174.58 = 985.82 : x
2. Step 2: Convert to fraction form
   1,576.31/2,174.58 = 985.82/x
3. Step 3: Cross multiply
   1,576.31x = 2,174.58 × 985.82
4. Step 4: Simplify right side
   1,576.31x = 2,143,744.46
5. Step 5: Solve for x
   x = 2,143,744.46/1,576.31
6. Step 6: Final answer
   x = 1,359.98