Finding the Fourth Proportional to 2,120.89, 2,927.39 and 1,189.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.89 : 2,927.39 = 1,189.69 : x
2. Step 2: Convert to fraction form
   2,120.89/2,927.39 = 1,189.69/x
3. Step 3: Cross multiply
   2,120.89x = 2,927.39 × 1,189.69
4. Step 4: Simplify right side
   2,120.89x = 3,482,680.66
5. Step 5: Solve for x
   x = 3,482,680.66/2,120.89
6. Step 6: Final answer
   x = 1,642.08