Finding the Fourth Proportional to 1,988.32, 2,979.72 and 1,111.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,988.32 : 2,979.72 = 1,111.24 : x
2. Step 2: Convert to fraction form
   1,988.32/2,979.72 = 1,111.24/x
3. Step 3: Cross multiply
   1,988.32x = 2,979.72 × 1,111.24
4. Step 4: Simplify right side
   1,988.32x = 3,311,184.05
5. Step 5: Solve for x
   x = 3,311,184.05/1,988.32
6. Step 6: Final answer
   x = 1,665.32