Finding the Third Proportional to 31,788.39 and 66,199.46

Step by Step Solution

1. Step 1: Write the proportion equation
   31,788.39 : 66,199.46 = 66,199.46 : x
2. Step 2: Convert to fraction form
   31,788.39/66,199.46 = 66,199.46/x
3. Step 3: Cross multiply
   31,788.39x = 66,199.46 × 66,199.46
4. Step 4: Simplify right side
   31,788.39x = 4,382,369,145.60
5. Step 5: Solve for x
   x = 4,382,369,145.60/31,788.39
6. Step 6: Final answer
   x = 137,860.70