Finding the Third Proportional to 31,788 and 69,111

Step by Step Solution

1. Step 1: Write the proportion equation
   31,788 : 69,111 = 69,111 : x
2. Step 2: Convert to fraction form
   31,788/69,111 = 69,111/x
3. Step 3: Cross multiply
   31,788x = 69,111 × 69,111
4. Step 4: Simplify right side
   31,788x = 4,776,330,321
5. Step 5: Solve for x
   x = 4,776,330,321/31,788
6. Step 6: Final answer
   x = 150,255.77