Finding the Fourth Proportional to 2,641.91, 3,642.86 and 1,976.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.91 : 3,642.86 = 1,976.63 : x
2. Step 2: Convert to fraction form
   2,641.91/3,642.86 = 1,976.63/x
3. Step 3: Cross multiply
   2,641.91x = 3,642.86 × 1,976.63
4. Step 4: Simplify right side
   2,641.91x = 7,200,576.48
5. Step 5: Solve for x
   x = 7,200,576.48/2,641.91
6. Step 6: Final answer
   x = 2,725.52