Finding the Fourth Proportional to 1,577.31, 2,174.75 and 986.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,577.31 : 2,174.75 = 986.82 : x
2. Step 2: Convert to fraction form
   1,577.31/2,174.75 = 986.82/x
3. Step 3: Cross multiply
   1,577.31x = 2,174.75 × 986.82
4. Step 4: Simplify right side
   1,577.31x = 2,146,086.80
5. Step 5: Solve for x
   x = 2,146,086.80/1,577.31
6. Step 6: Final answer
   x = 1,360.60