Finding the Fourth Proportional to 7,145.74, 10,716.82 and 2,985.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.74 : 10,716.82 = 2,985.78 : x
2. Step 2: Convert to fraction form
   7,145.74/10,716.82 = 2,985.78/x
3. Step 3: Cross multiply
   7,145.74x = 10,716.82 × 2,985.78
4. Step 4: Simplify right side
   7,145.74x = 31,998,066.82
5. Step 5: Solve for x
   x = 31,998,066.82/7,145.74
6. Step 6: Final answer
   x = 4,477.92