Finding the Fourth Proportional to 1,189.79, 1,641.92 and 692.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.79 : 1,641.92 = 692.72 : x
2. Step 2: Convert to fraction form
   1,189.79/1,641.92 = 692.72/x
3. Step 3: Cross multiply
   1,189.79x = 1,641.92 × 692.72
4. Step 4: Simplify right side
   1,189.79x = 1,137,390.82
5. Step 5: Solve for x
   x = 1,137,390.82/1,189.79
6. Step 6: Final answer
   x = 955.96