Finding the Fourth Proportional to 7,909.50, 10,915.30 and 5,119.86

Step by Step Solution

1. Step 1: Write the proportion equation
   7,909.50 : 10,915.30 = 5,119.86 : x
2. Step 2: Convert to fraction form
   7,909.50/10,915.30 = 5,119.86/x
3. Step 3: Cross multiply
   7,909.50x = 10,915.30 × 5,119.86
4. Step 4: Simplify right side
   7,909.50x = 55,884,807.86
5. Step 5: Solve for x
   x = 55,884,807.86/7,909.50
6. Step 6: Final answer
   x = 7,065.53