Finding the Third Proportional to 272,254.50 and 387,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   272,254.50 : 387,112.50 = 387,112.50 : x
2. Step 2: Convert to fraction form
   272,254.50/387,112.50 = 387,112.50/x
3. Step 3: Cross multiply
   272,254.50x = 387,112.50 × 387,112.50
4. Step 4: Simplify right side
   272,254.50x = 149,856,087,656.25
5. Step 5: Solve for x
   x = 149,856,087,656.25/272,254.50
6. Step 6: Final answer
   x = 550,426.49