Finding the Fourth Proportional to 1,190.89, 1,643.05 and 666.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,190.89 : 1,643.05 = 666.82 : x
2. Step 2: Convert to fraction form
   1,190.89/1,643.05 = 666.82/x
3. Step 3: Cross multiply
   1,190.89x = 1,643.05 × 666.82
4. Step 4: Simplify right side
   1,190.89x = 1,095,618.60
5. Step 5: Solve for x
   x = 1,095,618.60/1,190.89
6. Step 6: Final answer
   x = 920.00