Finding the Fourth Proportional to 1,543.89, 2,130.57 and 845.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.89 : 2,130.57 = 845.25 : x
2. Step 2: Convert to fraction form
   1,543.89/2,130.57 = 845.25/x
3. Step 3: Cross multiply
   1,543.89x = 2,130.57 × 845.25
4. Step 4: Simplify right side
   1,543.89x = 1,800,864.29
5. Step 5: Solve for x
   x = 1,800,864.29/1,543.89
6. Step 6: Final answer
   x = 1,166.45