Finding the Fourth Proportional to 1,218.33, 1,680.59 and 845.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.33 : 1,680.59 = 845.63 : x
2. Step 2: Convert to fraction form
   1,218.33/1,680.59 = 845.63/x
3. Step 3: Cross multiply
   1,218.33x = 1,680.59 × 845.63
4. Step 4: Simplify right side
   1,218.33x = 1,421,144.69
5. Step 5: Solve for x
   x = 1,421,144.69/1,218.33
6. Step 6: Final answer
   x = 1,166.47