Finding the Fourth Proportional to 2,600.55, 3,588.80 and 1,421.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,600.55 : 3,588.80 = 1,421.60 : x
2. Step 2: Convert to fraction form
   2,600.55/3,588.80 = 1,421.60/x
3. Step 3: Cross multiply
   2,600.55x = 3,588.80 × 1,421.60
4. Step 4: Simplify right side
   2,600.55x = 5,101,813.03
5. Step 5: Solve for x
   x = 5,101,813.03/2,600.55
6. Step 6: Final answer
   x = 1,961.82