Finding the Fourth Proportional to 5,145.48, 7,100.76 and 2,787.60

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.48 : 7,100.76 = 2,787.60 : x
2. Step 2: Convert to fraction form
   5,145.48/7,100.76 = 2,787.60/x
3. Step 3: Cross multiply
   5,145.48x = 7,100.76 × 2,787.60
4. Step 4: Simplify right side
   5,145.48x = 19,794,078.58
5. Step 5: Solve for x
   x = 19,794,078.58/5,145.48
6. Step 6: Final answer
   x = 3,846.89