Finding the Fourth Proportional to 1,891.62, 2,610.72 and 1,145.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,891.62 : 2,610.72 = 1,145.16 : x
2. Step 2: Convert to fraction form
   1,891.62/2,610.72 = 1,145.16/x
3. Step 3: Cross multiply
   1,891.62x = 2,610.72 × 1,145.16
4. Step 4: Simplify right side
   1,891.62x = 2,989,692.12
5. Step 5: Solve for x
   x = 2,989,692.12/1,891.62
6. Step 6: Final answer
   x = 1,580.49