Finding the Fourth Proportional to 12,907.50, 17,812.35 and 7,318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.50 : 17,812.35 = 7,318.50 : x
2. Step 2: Convert to fraction form
   12,907.50/17,812.35 = 7,318.50/x
3. Step 3: Cross multiply
   12,907.50x = 17,812.35 × 7,318.50
4. Step 4: Simplify right side
   12,907.50x = 130,359,683.48
5. Step 5: Solve for x
   x = 130,359,683.48/12,907.50
6. Step 6: Final answer
   x = 10,099.53