Finding the Fourth Proportional to 2,601.52, 3,902.20 and 870.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.52 : 3,902.20 = 870.16 : x
2. Step 2: Convert to fraction form
   2,601.52/3,902.20 = 870.16/x
3. Step 3: Cross multiply
   2,601.52x = 3,902.20 × 870.16
4. Step 4: Simplify right side
   2,601.52x = 3,395,538.35
5. Step 5: Solve for x
   x = 3,395,538.35/2,601.52
6. Step 6: Final answer
   x = 1,305.21