Finding the Fourth Proportional to 7,230.42, 9,978.11 and 4,086.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,230.42 : 9,978.11 = 4,086.60 : x
2. Step 2: Convert to fraction form
   7,230.42/9,978.11 = 4,086.60/x
3. Step 3: Cross multiply
   7,230.42x = 9,978.11 × 4,086.60
4. Step 4: Simplify right side
   7,230.42x = 40,776,523.89
5. Step 5: Solve for x
   x = 40,776,523.89/7,230.42
6. Step 6: Final answer
   x = 5,639.58