Finding the Fourth Proportional to 12,683.70, 17,507.57 and 8,907.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,683.70 : 17,507.57 = 8,907.78 : x
2. Step 2: Convert to fraction form
   12,683.70/17,507.57 = 8,907.78/x
3. Step 3: Cross multiply
   12,683.70x = 17,507.57 × 8,907.78
4. Step 4: Simplify right side
   12,683.70x = 155,953,581.89
5. Step 5: Solve for x
   x = 155,953,581.89/12,683.70
6. Step 6: Final answer
   x = 12,295.59