Finding the Fourth Proportional to 12,623.79, 17,413.61 and 7,899.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,623.79 : 17,413.61 = 7,899.87 : x
2. Step 2: Convert to fraction form
   12,623.79/17,413.61 = 7,899.87/x
3. Step 3: Cross multiply
   12,623.79x = 17,413.61 × 7,899.87
4. Step 4: Simplify right side
   12,623.79x = 137,565,215.73
5. Step 5: Solve for x
   x = 137,565,215.73/12,623.79
6. Step 6: Final answer
   x = 10,897.30