Finding the Fourth Proportional to 1,418.67, 1,957.43 and 913.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.67 : 1,957.43 = 913.61 : x
2. Step 2: Convert to fraction form
   1,418.67/1,957.43 = 913.61/x
3. Step 3: Cross multiply
   1,418.67x = 1,957.43 × 913.61
4. Step 4: Simplify right side
   1,418.67x = 1,788,313.27
5. Step 5: Solve for x
   x = 1,788,313.27/1,418.67
6. Step 6: Final answer
   x = 1,260.56