Finding the Fourth Proportional to 1,218.89, 1,680.67 and 952.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.89 : 1,680.67 = 952.81 : x
2. Step 2: Convert to fraction form
   1,218.89/1,680.67 = 952.81/x
3. Step 3: Cross multiply
   1,218.89x = 1,680.67 × 952.81
4. Step 4: Simplify right side
   1,218.89x = 1,601,359.18
5. Step 5: Solve for x
   x = 1,601,359.18/1,218.89
6. Step 6: Final answer
   x = 1,313.78