Finding the Third Proportional to 54,621 and 74,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,621 : 74,128.50 = 74,128.50 : x
2. Step 2: Convert to fraction form
   54,621/74,128.50 = 74,128.50/x
3. Step 3: Cross multiply
   54,621x = 74,128.50 × 74,128.50
4. Step 4: Simplify right side
   54,621x = 5,495,034,512.25
5. Step 5: Solve for x
   x = 5,495,034,512.25/54,621
6. Step 6: Final answer
   x = 100,602.96