Finding the Fourth Proportional to 2,920.88, 4,387.80 and 2,828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.88 : 4,387.80 = 2,828.72 : x
2. Step 2: Convert to fraction form
   2,920.88/4,387.80 = 2,828.72/x
3. Step 3: Cross multiply
   2,920.88x = 4,387.80 × 2,828.72
4. Step 4: Simplify right side
   2,920.88x = 12,411,857.62
5. Step 5: Solve for x
   x = 12,411,857.62/2,920.88
6. Step 6: Final answer
   x = 4,249.36