Finding the Fourth Proportional to 2,641.69, 3,961.05 and 1,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.69 : 3,961.05 = 1,322.50 : x
2. Step 2: Convert to fraction form
   2,641.69/3,961.05 = 1,322.50/x
3. Step 3: Cross multiply
   2,641.69x = 3,961.05 × 1,322.50
4. Step 4: Simplify right side
   2,641.69x = 5,238,488.63
5. Step 5: Solve for x
   x = 5,238,488.63/2,641.69
6. Step 6: Final answer
   x = 1,983.01