Finding the Fourth Proportional to 2,298.72, 3,445.05 and 911.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,298.72 : 3,445.05 = 911.30 : x
2. Step 2: Convert to fraction form
   2,298.72/3,445.05 = 911.30/x
3. Step 3: Cross multiply
   2,298.72x = 3,445.05 × 911.30
4. Step 4: Simplify right side
   2,298.72x = 3,139,469.76
5. Step 5: Solve for x
   x = 3,139,469.76/2,298.72
6. Step 6: Final answer
   x = 1,365.75