Finding the Third Proportional to 153,359 and 312,978

Step by Step Solution

1. Step 1: Write the proportion equation
   153,359 : 312,978 = 312,978 : x
2. Step 2: Convert to fraction form
   153,359/312,978 = 312,978/x
3. Step 3: Cross multiply
   153,359x = 312,978 × 312,978
4. Step 4: Simplify right side
   153,359x = 97,955,228,484
5. Step 5: Solve for x
   x = 97,955,228,484/153,359
6. Step 6: Final answer
   x = 638,731.53