Finding the Fourth Proportional to 1,189.31, 1,641.18 and 658.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.31 : 1,641.18 = 658.18 : x
2. Step 2: Convert to fraction form
   1,189.31/1,641.18 = 658.18/x
3. Step 3: Cross multiply
   1,189.31x = 1,641.18 × 658.18
4. Step 4: Simplify right side
   1,189.31x = 1,080,186.21
5. Step 5: Solve for x
   x = 1,080,186.21/1,189.31
6. Step 6: Final answer
   x = 908.24