Finding the Fourth Proportional to 1,173.12, 1,618.88 and 649.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.12 : 1,618.88 = 649.15 : x
2. Step 2: Convert to fraction form
   1,173.12/1,618.88 = 649.15/x
3. Step 3: Cross multiply
   1,173.12x = 1,618.88 × 649.15
4. Step 4: Simplify right side
   1,173.12x = 1,050,899.60
5. Step 5: Solve for x
   x = 1,050,899.60/1,173.12
6. Step 6: Final answer
   x = 895.82