Finding the Fourth Proportional to 1,189.91, 1,641.93 and 692.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.91 : 1,641.93 = 692.48 : x
2. Step 2: Convert to fraction form
   1,189.91/1,641.93 = 692.48/x
3. Step 3: Cross multiply
   1,189.91x = 1,641.93 × 692.48
4. Step 4: Simplify right side
   1,189.91x = 1,137,003.69
5. Step 5: Solve for x
   x = 1,137,003.69/1,189.91
6. Step 6: Final answer
   x = 955.54