Finding the Fourth Proportional to 2,445.25, 3,665.13 and 1,213.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,445.25 : 3,665.13 = 1,213.55 : x
2. Step 2: Convert to fraction form
   2,445.25/3,665.13 = 1,213.55/x
3. Step 3: Cross multiply
   2,445.25x = 3,665.13 × 1,213.55
4. Step 4: Simplify right side
   2,445.25x = 4,447,818.51
5. Step 5: Solve for x
   x = 4,447,818.51/2,445.25
6. Step 6: Final answer
   x = 1,818.96