Finding the Fourth Proportional to 981.34, 1,353.69 and 715.43

Step by Step Solution

1. Step 1: Write the proportion equation
   981.34 : 1,353.69 = 715.43 : x
2. Step 2: Convert to fraction form
   981.34/1,353.69 = 715.43/x
3. Step 3: Cross multiply
   981.34x = 1,353.69 × 715.43
4. Step 4: Simplify right side
   981.34x = 968,471.81
5. Step 5: Solve for x
   x = 968,471.81/981.34
6. Step 6: Final answer
   x = 986.89