Finding the Fourth Proportional to 2,601.43, 3,902.18 and 870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.43 : 3,902.18 = 870.05 : x
2. Step 2: Convert to fraction form
   2,601.43/3,902.18 = 870.05/x
3. Step 3: Cross multiply
   2,601.43x = 3,902.18 × 870.05
4. Step 4: Simplify right side
   2,601.43x = 3,395,097.11
5. Step 5: Solve for x
   x = 3,395,097.11/2,601.43
6. Step 6: Final answer
   x = 1,305.09