Finding the Fourth Proportional to 10,134.89, 13,978.89 and 8,788.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,134.89 : 13,978.89 = 8,788.08 : x
2. Step 2: Convert to fraction form
   10,134.89/13,978.89 = 8,788.08/x
3. Step 3: Cross multiply
   10,134.89x = 13,978.89 × 8,788.08
4. Step 4: Simplify right side
   10,134.89x = 122,847,603.63
5. Step 5: Solve for x
   x = 122,847,603.63/10,134.89
6. Step 6: Final answer
   x = 12,121.26