Finding the Fourth Proportional to 5,136.00, 7,087.69 and 2,778.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,136.00 : 7,087.69 = 2,778.15 : x
2. Step 2: Convert to fraction form
   5,136.00/7,087.69 = 2,778.15/x
3. Step 3: Cross multiply
   5,136.00x = 7,087.69 × 2,778.15
4. Step 4: Simplify right side
   5,136.00x = 19,690,623.20
5. Step 5: Solve for x
   x = 19,690,623.20/5,136.00
6. Step 6: Final answer
   x = 3,833.84