Finding the Third Proportional to 115,008 and 243,840

Step by Step Solution

1. Step 1: Write the proportion equation
   115,008 : 243,840 = 243,840 : x
2. Step 2: Convert to fraction form
   115,008/243,840 = 243,840/x
3. Step 3: Cross multiply
   115,008x = 243,840 × 243,840
4. Step 4: Simplify right side
   115,008x = 59,457,945,600
5. Step 5: Solve for x
   x = 59,457,945,600/115,008
6. Step 6: Final answer
   x = 516,989.65