Finding the Fourth Proportional to 5,145.30, 7,100.52 and 2,787.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.30 : 7,100.52 = 2,787.42 : x
2. Step 2: Convert to fraction form
   5,145.30/7,100.52 = 2,787.42/x
3. Step 3: Cross multiply
   5,145.30x = 7,100.52 × 2,787.42
4. Step 4: Simplify right side
   5,145.30x = 19,792,131.46
5. Step 5: Solve for x
   x = 19,792,131.46/5,145.30
6. Step 6: Final answer
   x = 3,846.64