Finding the Fourth Proportional to 2,298.78, 3,448.15 and 912.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,298.78 : 3,448.15 = 912.43 : x
2. Step 2: Convert to fraction form
   2,298.78/3,448.15 = 912.43/x
3. Step 3: Cross multiply
   2,298.78x = 3,448.15 × 912.43
4. Step 4: Simplify right side
   2,298.78x = 3,146,195.50
5. Step 5: Solve for x
   x = 3,146,195.50/2,298.78
6. Step 6: Final answer
   x = 1,368.64