Finding the Third Proportional to 61,435.50 and 129,427.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,435.50 : 129,427.50 = 129,427.50 : x
2. Step 2: Convert to fraction form
   61,435.50/129,427.50 = 129,427.50/x
3. Step 3: Cross multiply
   61,435.50x = 129,427.50 × 129,427.50
4. Step 4: Simplify right side
   61,435.50x = 16,751,477,756.25
5. Step 5: Solve for x
   x = 16,751,477,756.25/61,435.50
6. Step 6: Final answer
   x = 272,667.72