Finding the Fourth Proportional to 1,066.21, 1,471.14 and 611.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.21 : 1,471.14 = 611.86 : x
2. Step 2: Convert to fraction form
   1,066.21/1,471.14 = 611.86/x
3. Step 3: Cross multiply
   1,066.21x = 1,471.14 × 611.86
4. Step 4: Simplify right side
   1,066.21x = 900,131.72
5. Step 5: Solve for x
   x = 900,131.72/1,066.21
6. Step 6: Final answer
   x = 844.23