Finding the Third Proportional to 531,138 and 812,866.50

Step by Step Solution

1. Step 1: Write the proportion equation
   531,138 : 812,866.50 = 812,866.50 : x
2. Step 2: Convert to fraction form
   531,138/812,866.50 = 812,866.50/x
3. Step 3: Cross multiply
   531,138x = 812,866.50 × 812,866.50
4. Step 4: Simplify right side
   531,138x = 660,751,946,822.25
5. Step 5: Solve for x
   x = 660,751,946,822.25/531,138
6. Step 6: Final answer
   x = 1,244,030.64