Finding the Fourth Proportional to 2,878.69, 4,317.12 and 930.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.69 : 4,317.12 = 930.45 : x
2. Step 2: Convert to fraction form
   2,878.69/4,317.12 = 930.45/x
3. Step 3: Cross multiply
   2,878.69x = 4,317.12 × 930.45
4. Step 4: Simplify right side
   2,878.69x = 4,016,864.30
5. Step 5: Solve for x
   x = 4,016,864.30/2,878.69
6. Step 6: Final answer
   x = 1,395.38