Finding the Fourth Proportional to 7,647.21, 10,553.31 and 5,413.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,647.21 : 10,553.31 = 5,413.10 : x
2. Step 2: Convert to fraction form
   7,647.21/10,553.31 = 5,413.10/x
3. Step 3: Cross multiply
   7,647.21x = 10,553.31 × 5,413.10
4. Step 4: Simplify right side
   7,647.21x = 57,126,069.59
5. Step 5: Solve for x
   x = 57,126,069.59/7,647.21
6. Step 6: Final answer
   x = 7,470.18