Finding the Fourth Proportional to 7,155.72, 9,875.36 and 3,969.38

Step by Step Solution

1. Step 1: Write the proportion equation
   7,155.72 : 9,875.36 = 3,969.38 : x
2. Step 2: Convert to fraction form
   7,155.72/9,875.36 = 3,969.38/x
3. Step 3: Cross multiply
   7,155.72x = 9,875.36 × 3,969.38
4. Step 4: Simplify right side
   7,155.72x = 39,199,056.48
5. Step 5: Solve for x
   x = 39,199,056.48/7,155.72
6. Step 6: Final answer
   x = 5,478.00