Finding the Fourth Proportional to 1,856.72, 2,561.60 and 1,070.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.72 : 2,561.60 = 1,070.61 : x
2. Step 2: Convert to fraction form
   1,856.72/2,561.60 = 1,070.61/x
3. Step 3: Cross multiply
   1,856.72x = 2,561.60 × 1,070.61
4. Step 4: Simplify right side
   1,856.72x = 2,742,469.22
5. Step 5: Solve for x
   x = 2,742,469.22/1,856.72
6. Step 6: Final answer
   x = 1,477.05