Finding the Third Proportional to 61,153.50 and 128,938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,153.50 : 128,938.50 = 128,938.50 : x
2. Step 2: Convert to fraction form
   61,153.50/128,938.50 = 128,938.50/x
3. Step 3: Cross multiply
   61,153.50x = 128,938.50 × 128,938.50
4. Step 4: Simplify right side
   61,153.50x = 16,625,136,782.25
5. Step 5: Solve for x
   x = 16,625,136,782.25/61,153.50
6. Step 6: Final answer
   x = 271,859.12