Finding the Fourth Proportional to 2,298.47, 3,445.67 and 912.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,298.47 : 3,445.67 = 912.78 : x
2. Step 2: Convert to fraction form
   2,298.47/3,445.67 = 912.78/x
3. Step 3: Cross multiply
   2,298.47x = 3,445.67 × 912.78
4. Step 4: Simplify right side
   2,298.47x = 3,145,134.10
5. Step 5: Solve for x
   x = 3,145,134.10/2,298.47
6. Step 6: Final answer
   x = 1,368.36