Finding the Fourth Proportional to 1,011.42, 1,395.23 and 661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.42 : 1,395.23 = 661.50 : x
2. Step 2: Convert to fraction form
   1,011.42/1,395.23 = 661.50/x
3. Step 3: Cross multiply
   1,011.42x = 1,395.23 × 661.50
4. Step 4: Simplify right side
   1,011.42x = 922,941.34
5. Step 5: Solve for x
   x = 922,941.34/1,011.42
6. Step 6: Final answer
   x = 912.52