Finding the Third Proportional to 787 and 1,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   787 : 1,856.50 = 1,856.50 : x
2. Step 2: Convert to fraction form
   787/1,856.50 = 1,856.50/x
3. Step 3: Cross multiply
   787x = 1,856.50 × 1,856.50
4. Step 4: Simplify right side
   787x = 3,446,592.25
5. Step 5: Solve for x
   x = 3,446,592.25/787
6. Step 6: Final answer
   x = 4,379.41