Finding the Third Proportional to 288,396 and 430,204.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,396 : 430,204.50 = 430,204.50 : x
2. Step 2: Convert to fraction form
   288,396/430,204.50 = 430,204.50/x
3. Step 3: Cross multiply
   288,396x = 430,204.50 × 430,204.50
4. Step 4: Simplify right side
   288,396x = 185,075,911,820.25
5. Step 5: Solve for x
   x = 185,075,911,820.25/288,396
6. Step 6: Final answer
   x = 641,742.30