Finding the Fourth Proportional to 5,145.72, 7,101.05 and 2,907.57

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.72 : 7,101.05 = 2,907.57 : x
2. Step 2: Convert to fraction form
   5,145.72/7,101.05 = 2,907.57/x
3. Step 3: Cross multiply
   5,145.72x = 7,101.05 × 2,907.57
4. Step 4: Simplify right side
   5,145.72x = 20,646,799.95
5. Step 5: Solve for x
   x = 20,646,799.95/5,145.72
6. Step 6: Final answer
   x = 4,012.42