Finding the Fourth Proportional to 5,145.39, 7,100.60 and 2,907.81

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.39 : 7,100.60 = 2,907.81 : x
2. Step 2: Convert to fraction form
   5,145.39/7,100.60 = 2,907.81/x
3. Step 3: Cross multiply
   5,145.39x = 7,100.60 × 2,907.81
4. Step 4: Simplify right side
   5,145.39x = 20,647,181.15
5. Step 5: Solve for x
   x = 20,647,181.15/5,145.39
6. Step 6: Final answer
   x = 4,012.75