Finding the Fourth Proportional to 8,902.50, 12,277.32 and 7,643.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,902.50 : 12,277.32 = 7,643.15 : x
2. Step 2: Convert to fraction form
   8,902.50/12,277.32 = 7,643.15/x
3. Step 3: Cross multiply
   8,902.50x = 12,277.32 × 7,643.15
4. Step 4: Simplify right side
   8,902.50x = 93,837,429.05
5. Step 5: Solve for x
   x = 93,837,429.05/8,902.50
6. Step 6: Final answer
   x = 10,540.57