Finding the Third Proportional to 288,645 and 429,889.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,645 : 429,889.50 = 429,889.50 : x
2. Step 2: Convert to fraction form
   288,645/429,889.50 = 429,889.50/x
3. Step 3: Cross multiply
   288,645x = 429,889.50 × 429,889.50
4. Step 4: Simplify right side
   288,645x = 184,804,982,210.25
5. Step 5: Solve for x
   x = 184,804,982,210.25/288,645
6. Step 6: Final answer
   x = 640,250.07