Finding the Third Proportional to 399,577.50 and 850,009.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,577.50 : 850,009.50 = 850,009.50 : x
2. Step 2: Convert to fraction form
   399,577.50/850,009.50 = 850,009.50/x
3. Step 3: Cross multiply
   399,577.50x = 850,009.50 × 850,009.50
4. Step 4: Simplify right side
   399,577.50x = 722,516,150,090.25
5. Step 5: Solve for x
   x = 722,516,150,090.25/399,577.50
6. Step 6: Final answer
   x = 1,808,200.29