Finding the Fourth Proportional to 2,650.79, 3,978.09 and 2,136.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.79 : 3,978.09 = 2,136.98 : x
2. Step 2: Convert to fraction form
   2,650.79/3,978.09 = 2,136.98/x
3. Step 3: Cross multiply
   2,650.79x = 3,978.09 × 2,136.98
4. Step 4: Simplify right side
   2,650.79x = 8,501,108.71
5. Step 5: Solve for x
   x = 8,501,108.71/2,650.79
6. Step 6: Final answer
   x = 3,207.01