Finding the Third Proportional to 199,808 and 428,115.50

Step by Step Solution

1. Step 1: Write the proportion equation
   199,808 : 428,115.50 = 428,115.50 : x
2. Step 2: Convert to fraction form
   199,808/428,115.50 = 428,115.50/x
3. Step 3: Cross multiply
   199,808x = 428,115.50 × 428,115.50
4. Step 4: Simplify right side
   199,808x = 183,282,881,340.25
5. Step 5: Solve for x
   x = 183,282,881,340.25/199,808
6. Step 6: Final answer
   x = 917,295.01