Finding the Fourth Proportional to 2,987.05, 4,478.52 and 1,320.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.05 : 4,478.52 = 1,320.37 : x
2. Step 2: Convert to fraction form
   2,987.05/4,478.52 = 1,320.37/x
3. Step 3: Cross multiply
   2,987.05x = 4,478.52 × 1,320.37
4. Step 4: Simplify right side
   2,987.05x = 5,913,322.40
5. Step 5: Solve for x
   x = 5,913,322.40/2,987.05
6. Step 6: Final answer
   x = 1,979.65