Finding the Fourth Proportional to 2,146.68, 3,218.50 and 913.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.68 : 3,218.50 = 913.45 : x
2. Step 2: Convert to fraction form
   2,146.68/3,218.50 = 913.45/x
3. Step 3: Cross multiply
   2,146.68x = 3,218.50 × 913.45
4. Step 4: Simplify right side
   2,146.68x = 2,939,938.83
5. Step 5: Solve for x
   x = 2,939,938.83/2,146.68
6. Step 6: Final answer
   x = 1,369.53