Finding the Fourth Proportional to 1,189.89, 1,642.15 and 692.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.89 : 1,642.15 = 692.58 : x
2. Step 2: Convert to fraction form
   1,189.89/1,642.15 = 692.58/x
3. Step 3: Cross multiply
   1,189.89x = 1,642.15 × 692.58
4. Step 4: Simplify right side
   1,189.89x = 1,137,311.47
5. Step 5: Solve for x
   x = 1,137,311.47/1,189.89
6. Step 6: Final answer
   x = 955.81