Finding the Fourth Proportional to 1,643.29, 2,265.25 and 1,245.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.29 : 2,265.25 = 1,245.07 : x
2. Step 2: Convert to fraction form
   1,643.29/2,265.25 = 1,245.07/x
3. Step 3: Cross multiply
   1,643.29x = 2,265.25 × 1,245.07
4. Step 4: Simplify right side
   1,643.29x = 2,820,388.59
5. Step 5: Solve for x
   x = 2,820,388.59/1,643.29
6. Step 6: Final answer
   x = 1,716.31