Finding the Fourth Proportional to 1,436.96, 1,983.28 and 913.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.96 : 1,983.28 = 913.60 : x
2. Step 2: Convert to fraction form
   1,436.96/1,983.28 = 913.60/x
3. Step 3: Cross multiply
   1,436.96x = 1,983.28 × 913.60
4. Step 4: Simplify right side
   1,436.96x = 1,811,924.61
5. Step 5: Solve for x
   x = 1,811,924.61/1,436.96
6. Step 6: Final answer
   x = 1,260.94