Finding the Fourth Proportional to 5,145.98, 7,101.45 and 2,788.10

Step by Step Solution

1. Step 1: Write the proportion equation
   5,145.98 : 7,101.45 = 2,788.10 : x
2. Step 2: Convert to fraction form
   5,145.98/7,101.45 = 2,788.10/x
3. Step 3: Cross multiply
   5,145.98x = 7,101.45 × 2,788.10
4. Step 4: Simplify right side
   5,145.98x = 19,799,552.75
5. Step 5: Solve for x
   x = 19,799,552.75/5,145.98
6. Step 6: Final answer
   x = 3,847.58