Finding the Fourth Proportional to 13,074.68, 18,040.71 and 7,770.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,074.68 : 18,040.71 = 7,770.80 : x
2. Step 2: Convert to fraction form
   13,074.68/18,040.71 = 7,770.80/x
3. Step 3: Cross multiply
   13,074.68x = 18,040.71 × 7,770.80
4. Step 4: Simplify right side
   13,074.68x = 140,190,749.27
5. Step 5: Solve for x
   x = 140,190,749.27/13,074.68
6. Step 6: Final answer
   x = 10,722.31