Finding the Third Proportional to 53,139 and 72,205.50

Step by Step Solution

1. Step 1: Write the proportion equation
   53,139 : 72,205.50 = 72,205.50 : x
2. Step 2: Convert to fraction form
   53,139/72,205.50 = 72,205.50/x
3. Step 3: Cross multiply
   53,139x = 72,205.50 × 72,205.50
4. Step 4: Simplify right side
   53,139x = 5,213,634,230.25
5. Step 5: Solve for x
   x = 5,213,634,230.25/53,139
6. Step 6: Final answer
   x = 98,113.14