Finding the Fourth Proportional to 2,147.01, 3,218.90 and 913.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.01 : 3,218.90 = 913.38 : x
2. Step 2: Convert to fraction form
   2,147.01/3,218.90 = 913.38/x
3. Step 3: Cross multiply
   2,147.01x = 3,218.90 × 913.38
4. Step 4: Simplify right side
   2,147.01x = 2,940,074.32
5. Step 5: Solve for x
   x = 2,940,074.32/2,147.01
6. Step 6: Final answer
   x = 1,369.38