Finding the Fourth Proportional to 1,643.16, 2,267.61 and 897.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.16 : 2,267.61 = 897.15 : x
2. Step 2: Convert to fraction form
   1,643.16/2,267.61 = 897.15/x
3. Step 3: Cross multiply
   1,643.16x = 2,267.61 × 897.15
4. Step 4: Simplify right side
   1,643.16x = 2,034,386.31
5. Step 5: Solve for x
   x = 2,034,386.31/1,643.16
6. Step 6: Final answer
   x = 1,238.09