Finding the Fourth Proportional to 1,320.72, 1,979.46 and 671.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.72 : 1,979.46 = 671.10 : x
2. Step 2: Convert to fraction form
   1,320.72/1,979.46 = 671.10/x
3. Step 3: Cross multiply
   1,320.72x = 1,979.46 × 671.10
4. Step 4: Simplify right side
   1,320.72x = 1,328,415.61
5. Step 5: Solve for x
   x = 1,328,415.61/1,320.72
6. Step 6: Final answer
   x = 1,005.83