Finding the Fourth Proportional to 2,185.60, 3,276.06 and 1,591.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.60 : 3,276.06 = 1,591.20 : x
2. Step 2: Convert to fraction form
   2,185.60/3,276.06 = 1,591.20/x
3. Step 3: Cross multiply
   2,185.60x = 3,276.06 × 1,591.20
4. Step 4: Simplify right side
   2,185.60x = 5,212,866.67
5. Step 5: Solve for x
   x = 5,212,866.67/2,185.60
6. Step 6: Final answer
   x = 2,385.10