Finding the Fourth Proportional to 1,455.39, 2,007.57 and 916.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,455.39 : 2,007.57 = 916.16 : x
2. Step 2: Convert to fraction form
   1,455.39/2,007.57 = 916.16/x
3. Step 3: Cross multiply
   1,455.39x = 2,007.57 × 916.16
4. Step 4: Simplify right side
   1,455.39x = 1,839,255.33
5. Step 5: Solve for x
   x = 1,839,255.33/1,455.39
6. Step 6: Final answer
   x = 1,263.75