Finding the Third Proportional to 52,870.50 and 81,990

Step by Step Solution

1. Step 1: Write the proportion equation
   52,870.50 : 81,990 = 81,990 : x
2. Step 2: Convert to fraction form
   52,870.50/81,990 = 81,990/x
3. Step 3: Cross multiply
   52,870.50x = 81,990 × 81,990
4. Step 4: Simplify right side
   52,870.50x = 6,722,360,100
5. Step 5: Solve for x
   x = 6,722,360,100/52,870.50
6. Step 6: Final answer
   x = 127,147.66