Finding the Fourth Proportional to 7,111.42, 9,813.74 and 3,967.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.42 : 9,813.74 = 3,967.61 : x
2. Step 2: Convert to fraction form
   7,111.42/9,813.74 = 3,967.61/x
3. Step 3: Cross multiply
   7,111.42x = 9,813.74 × 3,967.61
4. Step 4: Simplify right side
   7,111.42x = 38,937,024.05
5. Step 5: Solve for x
   x = 38,937,024.05/7,111.42
6. Step 6: Final answer
   x = 5,475.28