Finding the Fourth Proportional to 1,978.87, 2,968.23 and 939.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.87 : 2,968.23 = 939.37 : x
2. Step 2: Convert to fraction form
   1,978.87/2,968.23 = 939.37/x
3. Step 3: Cross multiply
   1,978.87x = 2,968.23 × 939.37
4. Step 4: Simplify right side
   1,978.87x = 2,788,266.22
5. Step 5: Solve for x
   x = 2,788,266.22/1,978.87
6. Step 6: Final answer
   x = 1,409.02