Finding the Third Proportional to 121,156.50 and 248,358

Step by Step Solution

1. Step 1: Write the proportion equation
   121,156.50 : 248,358 = 248,358 : x
2. Step 2: Convert to fraction form
   121,156.50/248,358 = 248,358/x
3. Step 3: Cross multiply
   121,156.50x = 248,358 × 248,358
4. Step 4: Simplify right side
   121,156.50x = 61,681,696,164
5. Step 5: Solve for x
   x = 61,681,696,164/121,156.50
6. Step 6: Final answer
   x = 509,107.61