Finding the Fourth Proportional to 1,980.10, 2,970.06 and 939.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.10 : 2,970.06 = 939.34 : x
2. Step 2: Convert to fraction form
   1,980.10/2,970.06 = 939.34/x
3. Step 3: Cross multiply
   1,980.10x = 2,970.06 × 939.34
4. Step 4: Simplify right side
   1,980.10x = 2,789,896.16
5. Step 5: Solve for x
   x = 2,789,896.16/1,980.10
6. Step 6: Final answer
   x = 1,408.97