Finding the Fourth Proportional to 1,191.02, 1,643.67 and 667.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.02 : 1,643.67 = 667.10 : x
2. Step 2: Convert to fraction form
   1,191.02/1,643.67 = 667.10/x
3. Step 3: Cross multiply
   1,191.02x = 1,643.67 × 667.10
4. Step 4: Simplify right side
   1,191.02x = 1,096,492.26
5. Step 5: Solve for x
   x = 1,096,492.26/1,191.02
6. Step 6: Final answer
   x = 920.63