Finding the Third Proportional to 61,389 and 90,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,389 : 90,139.50 = 90,139.50 : x
2. Step 2: Convert to fraction form
   61,389/90,139.50 = 90,139.50/x
3. Step 3: Cross multiply
   61,389x = 90,139.50 × 90,139.50
4. Step 4: Simplify right side
   61,389x = 8,125,129,460.25
5. Step 5: Solve for x
   x = 8,125,129,460.25/61,389
6. Step 6: Final answer
   x = 132,354.81