Finding the Third Proportional to 98,820 and 212,648.63

Step by Step Solution

1. Step 1: Write the proportion equation
   98,820 : 212,648.63 = 212,648.63 : x
2. Step 2: Convert to fraction form
   98,820/212,648.63 = 212,648.63/x
3. Step 3: Cross multiply
   98,820x = 212,648.63 × 212,648.63
4. Step 4: Simplify right side
   98,820x = 45,219,437,714.39
5. Step 5: Solve for x
   x = 45,219,437,714.39/98,820
6. Step 6: Final answer
   x = 457,593.99