Finding the Third Proportional to 55,411.50 and 121,209

Step by Step Solution

1. Step 1: Write the proportion equation
   55,411.50 : 121,209 = 121,209 : x
2. Step 2: Convert to fraction form
   55,411.50/121,209 = 121,209/x
3. Step 3: Cross multiply
   55,411.50x = 121,209 × 121,209
4. Step 4: Simplify right side
   55,411.50x = 14,691,621,681
5. Step 5: Solve for x
   x = 14,691,621,681/55,411.50
6. Step 6: Final answer
   x = 265,136.69