Finding the Third Proportional to 58,945.50 and 90,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,945.50 : 90,139.50 = 90,139.50 : x
2. Step 2: Convert to fraction form
   58,945.50/90,139.50 = 90,139.50/x
3. Step 3: Cross multiply
   58,945.50x = 90,139.50 × 90,139.50
4. Step 4: Simplify right side
   58,945.50x = 8,125,129,460.25
5. Step 5: Solve for x
   x = 8,125,129,460.25/58,945.50
6. Step 6: Final answer
   x = 137,841.39