Finding the Third Proportional to 38,990 and 56,905

Step by Step Solution

1. Step 1: Write the proportion equation
   38,990 : 56,905 = 56,905 : x
2. Step 2: Convert to fraction form
   38,990/56,905 = 56,905/x
3. Step 3: Cross multiply
   38,990x = 56,905 × 56,905
4. Step 4: Simplify right side
   38,990x = 3,238,179,025
5. Step 5: Solve for x
   x = 3,238,179,025/38,990
6. Step 6: Final answer
   x = 83,051.53