Finding the Fourth Proportional to 2,100.07, 3,150.05 and 866.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.07 : 3,150.05 = 866.54 : x
2. Step 2: Convert to fraction form
   2,100.07/3,150.05 = 866.54/x
3. Step 3: Cross multiply
   2,100.07x = 3,150.05 × 866.54
4. Step 4: Simplify right side
   2,100.07x = 2,729,647.87
5. Step 5: Solve for x
   x = 2,729,647.87/2,100.07
6. Step 6: Final answer
   x = 1,299.79