Finding the Fourth Proportional to 10,886.78, 16,335.30 and 5,345.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,886.78 : 16,335.30 = 5,345.30 : x
2. Step 2: Convert to fraction form
   10,886.78/16,335.30 = 5,345.30/x
3. Step 3: Cross multiply
   10,886.78x = 16,335.30 × 5,345.30
4. Step 4: Simplify right side
   10,886.78x = 87,317,079.09
5. Step 5: Solve for x
   x = 87,317,079.09/10,886.78
6. Step 6: Final answer
   x = 8,020.47