Finding the Fourth Proportional to 12,307.63, 18,430.56 and 7,608.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,307.63 : 18,430.56 = 7,608.31 : x
2. Step 2: Convert to fraction form
   12,307.63/18,430.56 = 7,608.31/x
3. Step 3: Cross multiply
   12,307.63x = 18,430.56 × 7,608.31
4. Step 4: Simplify right side
   12,307.63x = 140,225,413.95
5. Step 5: Solve for x
   x = 140,225,413.95/12,307.63
6. Step 6: Final answer
   x = 11,393.37