Finding the Fourth Proportional to 10,355.12, 14,290.23 and 5,878.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,355.12 : 14,290.23 = 5,878.78 : x
2. Step 2: Convert to fraction form
   10,355.12/14,290.23 = 5,878.78/x
3. Step 3: Cross multiply
   10,355.12x = 14,290.23 × 5,878.78
4. Step 4: Simplify right side
   10,355.12x = 84,009,118.32
5. Step 5: Solve for x
   x = 84,009,118.32/10,355.12
6. Step 6: Final answer
   x = 8,112.81