Finding the Fourth Proportional to 2,445.60, 3,665.12 and 2,185.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,445.60 : 3,665.12 = 2,185.28 : x
2. Step 2: Convert to fraction form
   2,445.60/3,665.12 = 2,185.28/x
3. Step 3: Cross multiply
   2,445.60x = 3,665.12 × 2,185.28
4. Step 4: Simplify right side
   2,445.60x = 8,009,313.43
5. Step 5: Solve for x
   x = 8,009,313.43/2,445.60
6. Step 6: Final answer
   x = 3,274.99