Finding the Fourth Proportional to 2,528.30, 3,486.69 and 1,643.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,528.30 : 3,486.69 = 1,643.78 : x
2. Step 2: Convert to fraction form
   2,528.30/3,486.69 = 1,643.78/x
3. Step 3: Cross multiply
   2,528.30x = 3,486.69 × 1,643.78
4. Step 4: Simplify right side
   2,528.30x = 5,731,333.85
5. Step 5: Solve for x
   x = 5,731,333.85/2,528.30
6. Step 6: Final answer
   x = 2,266.88