Finding the Fourth Proportional to 2,987.09, 4,479.18 and 906.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.09 : 4,479.18 = 906.71 : x
2. Step 2: Convert to fraction form
   2,987.09/4,479.18 = 906.71/x
3. Step 3: Cross multiply
   2,987.09x = 4,479.18 × 906.71
4. Step 4: Simplify right side
   2,987.09x = 4,061,317.30
5. Step 5: Solve for x
   x = 4,061,317.30/2,987.09
6. Step 6: Final answer
   x = 1,359.62