Finding the Fourth Proportional to 12,485.68, 17,230.76 and 7,180.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.68 : 17,230.76 = 7,180.50 : x
2. Step 2: Convert to fraction form
   12,485.68/17,230.76 = 7,180.50/x
3. Step 3: Cross multiply
   12,485.68x = 17,230.76 × 7,180.50
4. Step 4: Simplify right side
   12,485.68x = 123,725,430.90
5. Step 5: Solve for x
   x = 123,725,430.90/12,485.68
6. Step 6: Final answer
   x = 9,909.39