Finding the Fourth Proportional to 12,303.78, 16,978.05 and 7,587.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,303.78 : 16,978.05 = 7,587.15 : x
2. Step 2: Convert to fraction form
   12,303.78/16,978.05 = 7,587.15/x
3. Step 3: Cross multiply
   12,303.78x = 16,978.05 × 7,587.15
4. Step 4: Simplify right side
   12,303.78x = 128,815,012.06
5. Step 5: Solve for x
   x = 128,815,012.06/12,303.78
6. Step 6: Final answer
   x = 10,469.55