Finding the Third Proportional to 54,256 and 83,490

Step by Step Solution

1. Step 1: Write the proportion equation
   54,256 : 83,490 = 83,490 : x
2. Step 2: Convert to fraction form
   54,256/83,490 = 83,490/x
3. Step 3: Cross multiply
   54,256x = 83,490 × 83,490
4. Step 4: Simplify right side
   54,256x = 6,970,580,100
5. Step 5: Solve for x
   x = 6,970,580,100/54,256
6. Step 6: Final answer
   x = 128,475.75