Finding the Fourth Proportional to 1,161.38, 1,602.72 and 637.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,161.38 : 1,602.72 = 637.42 : x
2. Step 2: Convert to fraction form
   1,161.38/1,602.72 = 637.42/x
3. Step 3: Cross multiply
   1,161.38x = 1,602.72 × 637.42
4. Step 4: Simplify right side
   1,161.38x = 1,021,605.78
5. Step 5: Solve for x
   x = 1,021,605.78/1,161.38
6. Step 6: Final answer
   x = 879.65