Finding the Fourth Proportional to 1,164.16, 1,606.54 and 666.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.16 : 1,606.54 = 666.79 : x
2. Step 2: Convert to fraction form
   1,164.16/1,606.54 = 666.79/x
3. Step 3: Cross multiply
   1,164.16x = 1,606.54 × 666.79
4. Step 4: Simplify right side
   1,164.16x = 1,071,221.47
5. Step 5: Solve for x
   x = 1,071,221.47/1,164.16
6. Step 6: Final answer
   x = 920.17