Finding the Fourth Proportional to 1,984.55, 2,978.64 and 1,865.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.55 : 2,978.64 = 1,865.48 : x
2. Step 2: Convert to fraction form
   1,984.55/2,978.64 = 1,865.48/x
3. Step 3: Cross multiply
   1,984.55x = 2,978.64 × 1,865.48
4. Step 4: Simplify right side
   1,984.55x = 5,556,578.45
5. Step 5: Solve for x
   x = 5,556,578.45/1,984.55
6. Step 6: Final answer
   x = 2,799.93