Finding the Third Proportional to 520,438.50 and 816,601.50

Step by Step Solution

1. Step 1: Write the proportion equation
   520,438.50 : 816,601.50 = 816,601.50 : x
2. Step 2: Convert to fraction form
   520,438.50/816,601.50 = 816,601.50/x
3. Step 3: Cross multiply
   520,438.50x = 816,601.50 × 816,601.50
4. Step 4: Simplify right side
   520,438.50x = 666,838,009,802.25
5. Step 5: Solve for x
   x = 666,838,009,802.25/520,438.50
6. Step 6: Final answer
   x = 1,281,300.31