Finding the Fourth Proportional to 1,681.48, 2,320.20 and 982.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.48 : 2,320.20 = 982.72 : x
2. Step 2: Convert to fraction form
   1,681.48/2,320.20 = 982.72/x
3. Step 3: Cross multiply
   1,681.48x = 2,320.20 × 982.72
4. Step 4: Simplify right side
   1,681.48x = 2,280,106.94
5. Step 5: Solve for x
   x = 2,280,106.94/1,681.48
6. Step 6: Final answer
   x = 1,356.01