Finding the Third Proportional to 550,438.50 and 842,071.50

Step by Step Solution

1. Step 1: Write the proportion equation
   550,438.50 : 842,071.50 = 842,071.50 : x
2. Step 2: Convert to fraction form
   550,438.50/842,071.50 = 842,071.50/x
3. Step 3: Cross multiply
   550,438.50x = 842,071.50 × 842,071.50
4. Step 4: Simplify right side
   550,438.50x = 709,084,411,112.25
5. Step 5: Solve for x
   x = 709,084,411,112.25/550,438.50
6. Step 6: Final answer
   x = 1,288,217.32