Finding the Fourth Proportional to 1,553.86, 2,143.47 and 964.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.86 : 2,143.47 = 964.27 : x
2. Step 2: Convert to fraction form
   1,553.86/2,143.47 = 964.27/x
3. Step 3: Cross multiply
   1,553.86x = 2,143.47 × 964.27
4. Step 4: Simplify right side
   1,553.86x = 2,066,883.82
5. Step 5: Solve for x
   x = 2,066,883.82/1,553.86
6. Step 6: Final answer
   x = 1,330.16