Finding the Third Proportional to 139,248 and 242,770.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,248 : 242,770.50 = 242,770.50 : x
2. Step 2: Convert to fraction form
   139,248/242,770.50 = 242,770.50/x
3. Step 3: Cross multiply
   139,248x = 242,770.50 × 242,770.50
4. Step 4: Simplify right side
   139,248x = 58,937,515,670.25
5. Step 5: Solve for x
   x = 58,937,515,670.25/139,248
6. Step 6: Final answer
   x = 423,255.74