Finding the Fourth Proportional to 1,860.72, 2,789.40 and 705.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860.72 : 2,789.40 = 705.64 : x
2. Step 2: Convert to fraction form
   1,860.72/2,789.40 = 705.64/x
3. Step 3: Cross multiply
   1,860.72x = 2,789.40 × 705.64
4. Step 4: Simplify right side
   1,860.72x = 1,968,312.22
5. Step 5: Solve for x
   x = 1,968,312.22/1,860.72
6. Step 6: Final answer
   x = 1,057.82