Finding the Third Proportional to 58,815 and 138,820.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,815 : 138,820.50 = 138,820.50 : x
2. Step 2: Convert to fraction form
   58,815/138,820.50 = 138,820.50/x
3. Step 3: Cross multiply
   58,815x = 138,820.50 × 138,820.50
4. Step 4: Simplify right side
   58,815x = 19,271,131,220.25
5. Step 5: Solve for x
   x = 19,271,131,220.25/58,815
6. Step 6: Final answer
   x = 327,656.74