Finding the Fourth Proportional to 1,980.79, 2,969.22 and 938.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.79 : 2,969.22 = 938.96 : x
2. Step 2: Convert to fraction form
   1,980.79/2,969.22 = 938.96/x
3. Step 3: Cross multiply
   1,980.79x = 2,969.22 × 938.96
4. Step 4: Simplify right side
   1,980.79x = 2,787,978.81
5. Step 5: Solve for x
   x = 2,787,978.81/1,980.79
6. Step 6: Final answer
   x = 1,407.51