Finding the Fourth Proportional to 2,415.51, 3,623.57 and 855.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415.51 : 3,623.57 = 855.15 : x
2. Step 2: Convert to fraction form
   2,415.51/3,623.57 = 855.15/x
3. Step 3: Cross multiply
   2,415.51x = 3,623.57 × 855.15
4. Step 4: Simplify right side
   2,415.51x = 3,098,695.89
5. Step 5: Solve for x
   x = 3,098,695.89/2,415.51
6. Step 6: Final answer
   x = 1,282.83