Finding the Fourth Proportional to 2,987.30, 4,479.82 and 906.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.30 : 4,479.82 = 906.70 : x
2. Step 2: Convert to fraction form
   2,987.30/4,479.82 = 906.70/x
3. Step 3: Cross multiply
   2,987.30x = 4,479.82 × 906.70
4. Step 4: Simplify right side
   2,987.30x = 4,061,852.79
5. Step 5: Solve for x
   x = 4,061,852.79/2,987.30
6. Step 6: Final answer
   x = 1,359.71