Finding the Fourth Proportional to 9,413.51, 12,990.83 and 5,164.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.51 : 12,990.83 = 5,164.79 : x
2. Step 2: Convert to fraction form
   9,413.51/12,990.83 = 5,164.79/x
3. Step 3: Cross multiply
   9,413.51x = 12,990.83 × 5,164.79
4. Step 4: Simplify right side
   9,413.51x = 67,094,915.53
5. Step 5: Solve for x
   x = 67,094,915.53/9,413.51
6. Step 6: Final answer
   x = 7,127.51