Finding the Third Proportional to 65,210.91 and 137,425.78

Step by Step Solution

1. Step 1: Write the proportion equation
   65,210.91 : 137,425.78 = 137,425.78 : x
2. Step 2: Convert to fraction form
   65,210.91/137,425.78 = 137,425.78/x
3. Step 3: Cross multiply
   65,210.91x = 137,425.78 × 137,425.78
4. Step 4: Simplify right side
   65,210.91x = 18,885,845,352.17
5. Step 5: Solve for x
   x = 18,885,845,352.17/65,210.91
6. Step 6: Final answer
   x = 289,611.76