Finding the Third Proportional to 30,435.75 and 64,903.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,435.75 : 64,903.78 = 64,903.78 : x
2. Step 2: Convert to fraction form
   30,435.75/64,903.78 = 64,903.78/x
3. Step 3: Cross multiply
   30,435.75x = 64,903.78 × 64,903.78
4. Step 4: Simplify right side
   30,435.75x = 4,212,500,820.55
5. Step 5: Solve for x
   x = 4,212,500,820.55/30,435.75
6. Step 6: Final answer
   x = 138,406.34