Finding the Fourth Proportional to 1,861.34, 2,568.86 and 1,189.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.34 : 2,568.86 = 1,189.77 : x
2. Step 2: Convert to fraction form
   1,861.34/2,568.86 = 1,189.77/x
3. Step 3: Cross multiply
   1,861.34x = 2,568.86 × 1,189.77
4. Step 4: Simplify right side
   1,861.34x = 3,056,352.56
5. Step 5: Solve for x
   x = 3,056,352.56/1,861.34
6. Step 6: Final answer
   x = 1,642.02