Finding the Fourth Proportional to 1,200.86, 1,789.52 and 1,161.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.86 : 1,789.52 = 1,161.71 : x
2. Step 2: Convert to fraction form
   1,200.86/1,789.52 = 1,161.71/x
3. Step 3: Cross multiply
   1,200.86x = 1,789.52 × 1,161.71
4. Step 4: Simplify right side
   1,200.86x = 2,078,903.28
5. Step 5: Solve for x
   x = 2,078,903.28/1,200.86
6. Step 6: Final answer
   x = 1,731.18