Finding the Third Proportional to 134,878.50 and 289,440

Step by Step Solution

1. Step 1: Write the proportion equation
   134,878.50 : 289,440 = 289,440 : x
2. Step 2: Convert to fraction form
   134,878.50/289,440 = 289,440/x
3. Step 3: Cross multiply
   134,878.50x = 289,440 × 289,440
4. Step 4: Simplify right side
   134,878.50x = 83,775,513,600
5. Step 5: Solve for x
   x = 83,775,513,600/134,878.50
6. Step 6: Final answer
   x = 621,118.37