Finding the Fourth Proportional to 3,520.79, 5,284.37 and 1,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,520.79 : 5,284.37 = 1,878.72 : x
2. Step 2: Convert to fraction form
   3,520.79/5,284.37 = 1,878.72/x
3. Step 3: Cross multiply
   3,520.79x = 5,284.37 × 1,878.72
4. Step 4: Simplify right side
   3,520.79x = 9,927,851.61
5. Step 5: Solve for x
   x = 9,927,851.61/3,520.79
6. Step 6: Final answer
   x = 2,819.78