Finding the Fourth Proportional to 9,065.07, 13,601.06 and 5,120.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,065.07 : 13,601.06 = 5,120.78 : x
2. Step 2: Convert to fraction form
   9,065.07/13,601.06 = 5,120.78/x
3. Step 3: Cross multiply
   9,065.07x = 13,601.06 × 5,120.78
4. Step 4: Simplify right side
   9,065.07x = 69,647,980.82
5. Step 5: Solve for x
   x = 69,647,980.82/9,065.07
6. Step 6: Final answer
   x = 7,683.12