Finding the Third Proportional to 274,617 and 578,758.50

Step by Step Solution

1. Step 1: Write the proportion equation
   274,617 : 578,758.50 = 578,758.50 : x
2. Step 2: Convert to fraction form
   274,617/578,758.50 = 578,758.50/x
3. Step 3: Cross multiply
   274,617x = 578,758.50 × 578,758.50
4. Step 4: Simplify right side
   274,617x = 334,961,401,322.25
5. Step 5: Solve for x
   x = 334,961,401,322.25/274,617
6. Step 6: Final answer
   x = 1,219,740.22