Finding the Third Proportional to 121,320 and 263,254.50

Step by Step Solution

1. Step 1: Write the proportion equation
   121,320 : 263,254.50 = 263,254.50 : x
2. Step 2: Convert to fraction form
   121,320/263,254.50 = 263,254.50/x
3. Step 3: Cross multiply
   121,320x = 263,254.50 × 263,254.50
4. Step 4: Simplify right side
   121,320x = 69,302,931,770.25
5. Step 5: Solve for x
   x = 69,302,931,770.25/121,320
6. Step 6: Final answer
   x = 571,240.78