Finding the Fourth Proportional to 7,892.55, 10,869.57 and 7,720.33

Step by Step Solution

1. Step 1: Write the proportion equation
   7,892.55 : 10,869.57 = 7,720.33 : x
2. Step 2: Convert to fraction form
   7,892.55/10,869.57 = 7,720.33/x
3. Step 3: Cross multiply
   7,892.55x = 10,869.57 × 7,720.33
4. Step 4: Simplify right side
   7,892.55x = 83,916,640.18
5. Step 5: Solve for x
   x = 83,916,640.18/7,892.55
6. Step 6: Final answer
   x = 10,632.39