Finding the Fourth Proportional to 2,336.72, 3,505.17 and 931.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,336.72 : 3,505.17 = 931.40 : x
2. Step 2: Convert to fraction form
   2,336.72/3,505.17 = 931.40/x
3. Step 3: Cross multiply
   2,336.72x = 3,505.17 × 931.40
4. Step 4: Simplify right side
   2,336.72x = 3,264,697.81
5. Step 5: Solve for x
   x = 3,264,697.81/2,336.72
6. Step 6: Final answer
   x = 1,397.13