Finding the Fourth Proportional to 2,072.81, 2,860.89 and 1,189.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.81 : 2,860.89 = 1,189.21 : x
2. Step 2: Convert to fraction form
   2,072.81/2,860.89 = 1,189.21/x
3. Step 3: Cross multiply
   2,072.81x = 2,860.89 × 1,189.21
4. Step 4: Simplify right side
   2,072.81x = 3,402,199.00
5. Step 5: Solve for x
   x = 3,402,199.00/2,072.81
6. Step 6: Final answer
   x = 1,641.35