Finding the Fourth Proportional to 1,604.60, 2,415.42 and 1,145.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.60 : 2,415.42 = 1,145.55 : x
2. Step 2: Convert to fraction form
   1,604.60/2,415.42 = 1,145.55/x
3. Step 3: Cross multiply
   1,604.60x = 2,415.42 × 1,145.55
4. Step 4: Simplify right side
   1,604.60x = 2,766,984.38
5. Step 5: Solve for x
   x = 2,766,984.38/1,604.60
6. Step 6: Final answer
   x = 1,724.41