Finding the Fourth Proportional to 1,142.54, 1,573.54 and 985.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.54 : 1,573.54 = 985.12 : x
2. Step 2: Convert to fraction form
   1,142.54/1,573.54 = 985.12/x
3. Step 3: Cross multiply
   1,142.54x = 1,573.54 × 985.12
4. Step 4: Simplify right side
   1,142.54x = 1,550,125.72
5. Step 5: Solve for x
   x = 1,550,125.72/1,142.54
6. Step 6: Final answer
   x = 1,356.74