Finding the Third Proportional to 31,720.50 and 69,719.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,720.50 : 69,719.63 = 69,719.63 : x
2. Step 2: Convert to fraction form
   31,720.50/69,719.63 = 69,719.63/x
3. Step 3: Cross multiply
   31,720.50x = 69,719.63 × 69,719.63
4. Step 4: Simplify right side
   31,720.50x = 4,860,826,110.14
5. Step 5: Solve for x
   x = 4,860,826,110.14/31,720.50
6. Step 6: Final answer
   x = 153,239.27