Finding the Third Proportional to 265,386 and 399,535.50

Step by Step Solution

1. Step 1: Write the proportion equation
   265,386 : 399,535.50 = 399,535.50 : x
2. Step 2: Convert to fraction form
   265,386/399,535.50 = 399,535.50/x
3. Step 3: Cross multiply
   265,386x = 399,535.50 × 399,535.50
4. Step 4: Simplify right side
   265,386x = 159,628,615,760.25
5. Step 5: Solve for x
   x = 159,628,615,760.25/265,386
6. Step 6: Final answer
   x = 601,495.99