Finding the Third Proportional to 39,456,342 and 86,455,404

Step by Step Solution

1. Step 1: Write the proportion equation
   39,456,342 : 86,455,404 = 86,455,404 : x
2. Step 2: Convert to fraction form
   39,456,342/86,455,404 = 86,455,404/x
3. Step 3: Cross multiply
   39,456,342x = 86,455,404 × 86,455,404
4. Step 4: Simplify right side
   39,456,342x = 7,474,536,880,803,216
5. Step 5: Solve for x
   x = 7,474,536,880,803,216/39,456,342
6. Step 6: Final answer
   x = 189,438,161.32