Finding the Third Proportional to 64,507 and 91,090.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,507 : 91,090.50 = 91,090.50 : x
2. Step 2: Convert to fraction form
   64,507/91,090.50 = 91,090.50/x
3. Step 3: Cross multiply
   64,507x = 91,090.50 × 91,090.50
4. Step 4: Simplify right side
   64,507x = 8,297,479,190.25
5. Step 5: Solve for x
   x = 8,297,479,190.25/64,507
6. Step 6: Final answer
   x = 128,629.13