Finding the Fourth Proportional to 1,986.03, 2,706.56 and 1,978.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.03 : 2,706.56 = 1,978.74 : x
2. Step 2: Convert to fraction form
   1,986.03/2,706.56 = 1,978.74/x
3. Step 3: Cross multiply
   1,986.03x = 2,706.56 × 1,978.74
4. Step 4: Simplify right side
   1,986.03x = 5,355,568.64
5. Step 5: Solve for x
   x = 5,355,568.64/1,986.03
6. Step 6: Final answer
   x = 2,696.62