Finding the Fourth Proportional to 9,320.76, 12,862.89 and 5,072.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.76 : 12,862.89 = 5,072.09 : x
2. Step 2: Convert to fraction form
   9,320.76/12,862.89 = 5,072.09/x
3. Step 3: Cross multiply
   9,320.76x = 12,862.89 × 5,072.09
4. Step 4: Simplify right side
   9,320.76x = 65,241,735.74
5. Step 5: Solve for x
   x = 65,241,735.74/9,320.76
6. Step 6: Final answer
   x = 6,999.62