Finding the Fourth Proportional to 12,985.98, 17,919.36 and 7,320.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985.98 : 17,919.36 = 7,320.60 : x
2. Step 2: Convert to fraction form
   12,985.98/17,919.36 = 7,320.60/x
3. Step 3: Cross multiply
   12,985.98x = 17,919.36 × 7,320.60
4. Step 4: Simplify right side
   12,985.98x = 131,180,466.82
5. Step 5: Solve for x
   x = 131,180,466.82/12,985.98
6. Step 6: Final answer
   x = 10,101.70