Finding the Fourth Proportional to 1,861.50, 2,568.15 and 1,189.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.50 : 2,568.15 = 1,189.56 : x
2. Step 2: Convert to fraction form
   1,861.50/2,568.15 = 1,189.56/x
3. Step 3: Cross multiply
   1,861.50x = 2,568.15 × 1,189.56
4. Step 4: Simplify right side
   1,861.50x = 3,054,968.51
5. Step 5: Solve for x
   x = 3,054,968.51/1,861.50
6. Step 6: Final answer
   x = 1,641.13