Finding the Fourth Proportional to 1,984.38, 2,993.90 and 1,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.38 : 2,993.90 = 1,978.92 : x
2. Step 2: Convert to fraction form
   1,984.38/2,993.90 = 1,978.92/x
3. Step 3: Cross multiply
   1,984.38x = 2,993.90 × 1,978.92
4. Step 4: Simplify right side
   1,984.38x = 5,924,678.69
5. Step 5: Solve for x
   x = 5,924,678.69/1,984.38
6. Step 6: Final answer
   x = 2,985.66