Finding the Fourth Proportional to 1,688.56, 2,330.17 and 942.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.56 : 2,330.17 = 942.55 : x
2. Step 2: Convert to fraction form
   1,688.56/2,330.17 = 942.55/x
3. Step 3: Cross multiply
   1,688.56x = 2,330.17 × 942.55
4. Step 4: Simplify right side
   1,688.56x = 2,196,301.73
5. Step 5: Solve for x
   x = 2,196,301.73/1,688.56
6. Step 6: Final answer
   x = 1,300.70