Finding the Third Proportional to 72,029.50 and 78,488

Step by Step Solution

1. Step 1: Write the proportion equation
   72,029.50 : 78,488 = 78,488 : x
2. Step 2: Convert to fraction form
   72,029.50/78,488 = 78,488/x
3. Step 3: Cross multiply
   72,029.50x = 78,488 × 78,488
4. Step 4: Simplify right side
   72,029.50x = 6,160,366,144
5. Step 5: Solve for x
   x = 6,160,366,144/72,029.50
6. Step 6: Final answer
   x = 85,525.60