Finding the Fourth Proportional to 5,145.48, 7,100.73 and 2,787.57

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.48 : 7,100.73 = 2,787.57 : x
2. Step 2: Convert to fraction form
   5,145.48/7,100.73 = 2,787.57/x
3. Step 3: Cross multiply
   5,145.48x = 7,100.73 × 2,787.57
4. Step 4: Simplify right side
   5,145.48x = 19,793,781.93
5. Step 5: Solve for x
   x = 19,793,781.93/5,145.48
6. Step 6: Final answer
   x = 3,846.83