Finding the Fourth Proportional to 2,415.34, 3,621.29 and 855.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415.34 : 3,621.29 = 855.02 : x
2. Step 2: Convert to fraction form
   2,415.34/3,621.29 = 855.02/x
3. Step 3: Cross multiply
   2,415.34x = 3,621.29 × 855.02
4. Step 4: Simplify right side
   2,415.34x = 3,096,275.38
5. Step 5: Solve for x
   x = 3,096,275.38/2,415.34
6. Step 6: Final answer
   x = 1,281.92