Finding the Fourth Proportional to 1,164.95, 1,607.90 and 667.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.95 : 1,607.90 = 667.87 : x
2. Step 2: Convert to fraction form
   1,164.95/1,607.90 = 667.87/x
3. Step 3: Cross multiply
   1,164.95x = 1,607.90 × 667.87
4. Step 4: Simplify right side
   1,164.95x = 1,073,868.17
5. Step 5: Solve for x
   x = 1,073,868.17/1,164.95
6. Step 6: Final answer
   x = 921.81