Finding the Third Proportional to 58,209 and 86,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,209 : 86,221.50 = 86,221.50 : x
2. Step 2: Convert to fraction form
   58,209/86,221.50 = 86,221.50/x
3. Step 3: Cross multiply
   58,209x = 86,221.50 × 86,221.50
4. Step 4: Simplify right side
   58,209x = 7,434,147,062.25
5. Step 5: Solve for x
   x = 7,434,147,062.25/58,209
6. Step 6: Final answer
   x = 127,714.74