Finding the Fourth Proportional to 2,485.17, 3,727.72 and 1,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.17 : 3,727.72 = 1,187.55 : x
2. Step 2: Convert to fraction form
   2,485.17/3,727.72 = 1,187.55/x
3. Step 3: Cross multiply
   2,485.17x = 3,727.72 × 1,187.55
4. Step 4: Simplify right side
   2,485.17x = 4,426,853.89
5. Step 5: Solve for x
   x = 4,426,853.89/2,485.17
6. Step 6: Final answer
   x = 1,781.31