Finding the Fourth Proportional to 1,688.72, 2,330.21 and 942.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.72 : 2,330.21 = 942.54 : x
2. Step 2: Convert to fraction form
   1,688.72/2,330.21 = 942.54/x
3. Step 3: Cross multiply
   1,688.72x = 2,330.21 × 942.54
4. Step 4: Simplify right side
   1,688.72x = 2,196,311.42
5. Step 5: Solve for x
   x = 2,196,311.42/1,688.72
6. Step 6: Final answer
   x = 1,300.58