Finding the Fourth Proportional to 1,164.15, 1,606.43 and 666.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.15 : 1,606.43 = 666.81 : x
2. Step 2: Convert to fraction form
   1,164.15/1,606.43 = 666.81/x
3. Step 3: Cross multiply
   1,164.15x = 1,606.43 × 666.81
4. Step 4: Simplify right side
   1,164.15x = 1,071,185.26
5. Step 5: Solve for x
   x = 1,071,185.26/1,164.15
6. Step 6: Final answer
   x = 920.14