Finding the Third Proportional to 28,421 and 42,631

Step by Step Solution

1. Step 1: Write the proportion equation
   28,421 : 42,631 = 42,631 : x
2. Step 2: Convert to fraction form
   28,421/42,631 = 42,631/x
3. Step 3: Cross multiply
   28,421x = 42,631 × 42,631
4. Step 4: Simplify right side
   28,421x = 1,817,402,161
5. Step 5: Solve for x
   x = 1,817,402,161/28,421
6. Step 6: Final answer
   x = 63,945.75