Finding the Fourth Proportional to 9,413.84, 12,989.40 and 5,435.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.84 : 12,989.40 = 5,435.12 : x
2. Step 2: Convert to fraction form
   9,413.84/12,989.40 = 5,435.12/x
3. Step 3: Cross multiply
   9,413.84x = 12,989.40 × 5,435.12
4. Step 4: Simplify right side
   9,413.84x = 70,598,947.73
5. Step 5: Solve for x
   x = 70,598,947.73/9,413.84
6. Step 6: Final answer
   x = 7,499.48