Finding the Fourth Proportional to 2,405, 3,320.52 and 1,555.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405 : 3,320.52 = 1,555.86 : x
2. Step 2: Convert to fraction form
   2,405/3,320.52 = 1,555.86/x
3. Step 3: Cross multiply
   2,405x = 3,320.52 × 1,555.86
4. Step 4: Simplify right side
   2,405x = 5,166,264.25
5. Step 5: Solve for x
   x = 5,166,264.25/2,405
6. Step 6: Final answer
   x = 2,148.13