Finding the Fourth Proportional to 2,642.60, 3,969.98 and 1,864.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.60 : 3,969.98 = 1,864.39 : x
2. Step 2: Convert to fraction form
   2,642.60/3,969.98 = 1,864.39/x
3. Step 3: Cross multiply
   2,642.60x = 3,969.98 × 1,864.39
4. Step 4: Simplify right side
   2,642.60x = 7,401,591.01
5. Step 5: Solve for x
   x = 7,401,591.01/2,642.60
6. Step 6: Final answer
   x = 2,800.87