Finding the Fourth Proportional to 2,656.63, 3,639.62 and 2,556.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.63 : 3,639.62 = 2,556.90 : x
2. Step 2: Convert to fraction form
   2,656.63/3,639.62 = 2,556.90/x
3. Step 3: Cross multiply
   2,656.63x = 3,639.62 × 2,556.90
4. Step 4: Simplify right side
   2,656.63x = 9,306,150.77
5. Step 5: Solve for x
   x = 9,306,150.77/2,656.63
6. Step 6: Final answer
   x = 3,502.99