Finding the Fourth Proportional to 13,078.48, 18,042.74 and 7,770.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.48 : 18,042.74 = 7,770.42 : x
2. Step 2: Convert to fraction form
   13,078.48/18,042.74 = 7,770.42/x
3. Step 3: Cross multiply
   13,078.48x = 18,042.74 × 7,770.42
4. Step 4: Simplify right side
   13,078.48x = 140,199,667.75
5. Step 5: Solve for x
   x = 140,199,667.75/13,078.48
6. Step 6: Final answer
   x = 10,719.87