Finding the Fourth Proportional to 1,145.78, 1,714.56 and 992.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.78 : 1,714.56 = 992.24 : x
2. Step 2: Convert to fraction form
   1,145.78/1,714.56 = 992.24/x
3. Step 3: Cross multiply
   1,145.78x = 1,714.56 × 992.24
4. Step 4: Simplify right side
   1,145.78x = 1,701,255.01
5. Step 5: Solve for x
   x = 1,701,255.01/1,145.78
6. Step 6: Final answer
   x = 1,484.80