Finding the Third Proportional to 31,369.78 and 68,390.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,369.78 : 68,390.74 = 68,390.74 : x
2. Step 2: Convert to fraction form
   31,369.78/68,390.74 = 68,390.74/x
3. Step 3: Cross multiply
   31,369.78x = 68,390.74 × 68,390.74
4. Step 4: Simplify right side
   31,369.78x = 4,677,292,815.50
5. Step 5: Solve for x
   x = 4,677,292,815.50/31,369.78
6. Step 6: Final answer
   x = 149,101.86