Finding the Third Proportional to 58,708.13 and 78,649.31

Step by Step Solution

1. Step 1: Write the proportion equation
   58,708.13 : 78,649.31 = 78,649.31 : x
2. Step 2: Convert to fraction form
   58,708.13/78,649.31 = 78,649.31/x
3. Step 3: Cross multiply
   58,708.13x = 78,649.31 × 78,649.31
4. Step 4: Simplify right side
   58,708.13x = 6,185,714,356.72
5. Step 5: Solve for x
   x = 6,185,714,356.72/58,708.13
6. Step 6: Final answer
   x = 105,363.85