Finding the Fourth Proportional to 1,440.96, 1,988.82 and 916.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.96 : 1,988.82 = 916.89 : x
2. Step 2: Convert to fraction form
   1,440.96/1,988.82 = 916.89/x
3. Step 3: Cross multiply
   1,440.96x = 1,988.82 × 916.89
4. Step 4: Simplify right side
   1,440.96x = 1,823,529.17
5. Step 5: Solve for x
   x = 1,823,529.17/1,440.96
6. Step 6: Final answer
   x = 1,265.50