Finding the Fourth Proportional to 1,979.29, 2,967.72 and 939.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,979.29 : 2,967.72 = 939.61 : x
2. Step 2: Convert to fraction form
   1,979.29/2,967.72 = 939.61/x
3. Step 3: Cross multiply
   1,979.29x = 2,967.72 × 939.61
4. Step 4: Simplify right side
   1,979.29x = 2,788,499.39
5. Step 5: Solve for x
   x = 2,788,499.39/1,979.29
6. Step 6: Final answer
   x = 1,408.84