Finding the Fourth Proportional to 2,642.12, 3,643.89 and 2,137.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.12 : 3,643.89 = 2,137.74 : x
2. Step 2: Convert to fraction form
   2,642.12/3,643.89 = 2,137.74/x
3. Step 3: Cross multiply
   2,642.12x = 3,643.89 × 2,137.74
4. Step 4: Simplify right side
   2,642.12x = 7,789,688.22
5. Step 5: Solve for x
   x = 7,789,688.22/2,642.12
6. Step 6: Final answer
   x = 2,948.27