Finding the Fourth Proportional to 1,164.87, 1,607.42 and 667.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.87 : 1,607.42 = 667.40 : x
2. Step 2: Convert to fraction form
   1,164.87/1,607.42 = 667.40/x
3. Step 3: Cross multiply
   1,164.87x = 1,607.42 × 667.40
4. Step 4: Simplify right side
   1,164.87x = 1,072,785.74
5. Step 5: Solve for x
   x = 1,072,785.74/1,164.87
6. Step 6: Final answer
   x = 920.95