Finding the Fourth Proportional to 10,077.54, 15,087.15 and 8,415.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,077.54 : 15,087.15 = 8,415.42 : x
2. Step 2: Convert to fraction form
   10,077.54/15,087.15 = 8,415.42/x
3. Step 3: Cross multiply
   10,077.54x = 15,087.15 × 8,415.42
4. Step 4: Simplify right side
   10,077.54x = 126,964,703.85
5. Step 5: Solve for x
   x = 126,964,703.85/10,077.54
6. Step 6: Final answer
   x = 12,598.78