Finding the Third Proportional to 121,215 and 186,061.50

Step by Step Solution

1. Step 1: Write the proportion equation
   121,215 : 186,061.50 = 186,061.50 : x
2. Step 2: Convert to fraction form
   121,215/186,061.50 = 186,061.50/x
3. Step 3: Cross multiply
   121,215x = 186,061.50 × 186,061.50
4. Step 4: Simplify right side
   121,215x = 34,618,881,782.25
5. Step 5: Solve for x
   x = 34,618,881,782.25/121,215
6. Step 6: Final answer
   x = 285,598.99