Finding the Fourth Proportional to 5,145.57, 7,100.88 and 2,787.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.57 : 7,100.88 = 2,787.72 : x
2. Step 2: Convert to fraction form
   5,145.57/7,100.88 = 2,787.72/x
3. Step 3: Cross multiply
   5,145.57x = 7,100.88 × 2,787.72
4. Step 4: Simplify right side
   5,145.57x = 19,795,265.19
5. Step 5: Solve for x
   x = 19,795,265.19/5,145.57
6. Step 6: Final answer
   x = 3,847.05