Finding the Fourth Proportional to 1,861.56, 2,790.42 and 706.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.56 : 2,790.42 = 706.50 : x
2. Step 2: Convert to fraction form
   1,861.56/2,790.42 = 706.50/x
3. Step 3: Cross multiply
   1,861.56x = 2,790.42 × 706.50
4. Step 4: Simplify right side
   1,861.56x = 1,971,431.73
5. Step 5: Solve for x
   x = 1,971,431.73/1,861.56
6. Step 6: Final answer
   x = 1,059.02