Finding the Fourth Proportional to 7,134.54, 9,845.58 and 3,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,134.54 : 9,845.58 = 3,990.72 : x
2. Step 2: Convert to fraction form
   7,134.54/9,845.58 = 3,990.72/x
3. Step 3: Cross multiply
   7,134.54x = 9,845.58 × 3,990.72
4. Step 4: Simplify right side
   7,134.54x = 39,290,953.02
5. Step 5: Solve for x
   x = 39,290,953.02/7,134.54
6. Step 6: Final answer
   x = 5,507.15