Finding the Fourth Proportional to 8,307.90, 12,413.27 and 8,017.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,307.90 : 12,413.27 = 8,017.31 : x
2. Step 2: Convert to fraction form
   8,307.90/12,413.27 = 8,017.31/x
3. Step 3: Cross multiply
   8,307.90x = 12,413.27 × 8,017.31
4. Step 4: Simplify right side
   8,307.90x = 99,520,931.55
5. Step 5: Solve for x
   x = 99,520,931.55/8,307.90
6. Step 6: Final answer
   x = 11,979.07