Finding the Fourth Proportional to 1,189.72, 1,641.90 and 692.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.72 : 1,641.90 = 692.38 : x
2. Step 2: Convert to fraction form
   1,189.72/1,641.90 = 692.38/x
3. Step 3: Cross multiply
   1,189.72x = 1,641.90 × 692.38
4. Step 4: Simplify right side
   1,189.72x = 1,136,818.72
5. Step 5: Solve for x
   x = 1,136,818.72/1,189.72
6. Step 6: Final answer
   x = 955.53