Finding the Fourth Proportional to 1,648.76, 2,275.32 and 986.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.76 : 2,275.32 = 986.12 : x
2. Step 2: Convert to fraction form
   1,648.76/2,275.32 = 986.12/x
3. Step 3: Cross multiply
   1,648.76x = 2,275.32 × 986.12
4. Step 4: Simplify right side
   1,648.76x = 2,243,738.56
5. Step 5: Solve for x
   x = 2,243,738.56/1,648.76
6. Step 6: Final answer
   x = 1,360.86