Finding the Fourth Proportional to 1,010.53, 1,394.17 and 661.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.53 : 1,394.17 = 661.42 : x
2. Step 2: Convert to fraction form
   1,010.53/1,394.17 = 661.42/x
3. Step 3: Cross multiply
   1,010.53x = 1,394.17 × 661.42
4. Step 4: Simplify right side
   1,010.53x = 922,131.92
5. Step 5: Solve for x
   x = 922,131.92/1,010.53
6. Step 6: Final answer
   x = 912.52