Finding the Fourth Proportional to 7,155.98, 9,875.85 and 3,970.27

Step by Step Solution

1. Step 1: Write the proportion equation
   7,155.98 : 9,875.85 = 3,970.27 : x
2. Step 2: Convert to fraction form
   7,155.98/9,875.85 = 3,970.27/x
3. Step 3: Cross multiply
   7,155.98x = 9,875.85 × 3,970.27
4. Step 4: Simplify right side
   7,155.98x = 39,209,790.98
5. Step 5: Solve for x
   x = 39,209,790.98/7,155.98
6. Step 6: Final answer
   x = 5,479.30