Finding the Fourth Proportional to 2,145.60, 3,216.24 and 1,172.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.60 : 3,216.24 = 1,172.52 : x
2. Step 2: Convert to fraction form
   2,145.60/3,216.24 = 1,172.52/x
3. Step 3: Cross multiply
   2,145.60x = 3,216.24 × 1,172.52
4. Step 4: Simplify right side
   2,145.60x = 3,771,105.72
5. Step 5: Solve for x
   x = 3,771,105.72/2,145.60
6. Step 6: Final answer
   x = 1,757.60