Finding the Fourth Proportional to 1,688.76, 2,330.12 and 980.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.76 : 2,330.12 = 980.58 : x
2. Step 2: Convert to fraction form
   1,688.76/2,330.12 = 980.58/x
3. Step 3: Cross multiply
   1,688.76x = 2,330.12 × 980.58
4. Step 4: Simplify right side
   1,688.76x = 2,284,869.07
5. Step 5: Solve for x
   x = 2,284,869.07/1,688.76
6. Step 6: Final answer
   x = 1,352.99