Finding the Fourth Proportional to 1,856.58, 2,785.89 and 761.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.58 : 2,785.89 = 761.71 : x
2. Step 2: Convert to fraction form
   1,856.58/2,785.89 = 761.71/x
3. Step 3: Cross multiply
   1,856.58x = 2,785.89 × 761.71
4. Step 4: Simplify right side
   1,856.58x = 2,122,040.27
5. Step 5: Solve for x
   x = 2,122,040.27/1,856.58
6. Step 6: Final answer
   x = 1,142.98