Finding the Fourth Proportional to 12,905.50, 17,809.59 and 7,316.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,905.50 : 17,809.59 = 7,316.50 : x
2. Step 2: Convert to fraction form
   12,905.50/17,809.59 = 7,316.50/x
3. Step 3: Cross multiply
   12,905.50x = 17,809.59 × 7,316.50
4. Step 4: Simplify right side
   12,905.50x = 130,303,865.24
5. Step 5: Solve for x
   x = 130,303,865.24/12,905.50
6. Step 6: Final answer
   x = 10,096.77