Finding the Fourth Proportional to 2,878.56, 4,308.69 and 2,357.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.56 : 4,308.69 = 2,357.31 : x
2. Step 2: Convert to fraction form
   2,878.56/4,308.69 = 2,357.31/x
3. Step 3: Cross multiply
   2,878.56x = 4,308.69 × 2,357.31
4. Step 4: Simplify right side
   2,878.56x = 10,156,918.02
5. Step 5: Solve for x
   x = 10,156,918.02/2,878.56
6. Step 6: Final answer
   x = 3,528.47