Finding the Third Proportional to 487,920 and 761,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   487,920 : 761,389.50 = 761,389.50 : x
2. Step 2: Convert to fraction form
   487,920/761,389.50 = 761,389.50/x
3. Step 3: Cross multiply
   487,920x = 761,389.50 × 761,389.50
4. Step 4: Simplify right side
   487,920x = 579,713,970,710.25
5. Step 5: Solve for x
   x = 579,713,970,710.25/487,920
6. Step 6: Final answer
   x = 1,188,133.24