Finding the Fourth Proportional to 10,087.78, 13,920.06 and 5,610.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,087.78 : 13,920.06 = 5,610.80 : x
2. Step 2: Convert to fraction form
   10,087.78/13,920.06 = 5,610.80/x
3. Step 3: Cross multiply
   10,087.78x = 13,920.06 × 5,610.80
4. Step 4: Simplify right side
   10,087.78x = 78,102,672.65
5. Step 5: Solve for x
   x = 78,102,672.65/10,087.78
6. Step 6: Final answer
   x = 7,742.31