Finding the Third Proportional to 191,811 and 287,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,811 : 287,719.50 = 287,719.50 : x
2. Step 2: Convert to fraction form
   191,811/287,719.50 = 287,719.50/x
3. Step 3: Cross multiply
   191,811x = 287,719.50 × 287,719.50
4. Step 4: Simplify right side
   191,811x = 82,782,510,680.25
5. Step 5: Solve for x
   x = 82,782,510,680.25/191,811
6. Step 6: Final answer
   x = 431,583.75