Finding the Third Proportional to 287,961 and 428,941.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,961 : 428,941.50 = 428,941.50 : x
2. Step 2: Convert to fraction form
   287,961/428,941.50 = 428,941.50/x
3. Step 3: Cross multiply
   287,961x = 428,941.50 × 428,941.50
4. Step 4: Simplify right side
   287,961x = 183,990,810,422.25
5. Step 5: Solve for x
   x = 183,990,810,422.25/287,961
6. Step 6: Final answer
   x = 638,943.50