Finding the Fourth Proportional to 2,119.86, 3,175.45 and 992.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.86 : 3,175.45 = 992.51 : x
2. Step 2: Convert to fraction form
   2,119.86/3,175.45 = 992.51/x
3. Step 3: Cross multiply
   2,119.86x = 3,175.45 × 992.51
4. Step 4: Simplify right side
   2,119.86x = 3,151,665.88
5. Step 5: Solve for x
   x = 3,151,665.88/2,119.86
6. Step 6: Final answer
   x = 1,486.73