Finding the Third Proportional to 139,854 and 215,090.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,854 : 215,090.50 = 215,090.50 : x
2. Step 2: Convert to fraction form
   139,854/215,090.50 = 215,090.50/x
3. Step 3: Cross multiply
   139,854x = 215,090.50 × 215,090.50
4. Step 4: Simplify right side
   139,854x = 46,263,923,190.25
5. Step 5: Solve for x
   x = 46,263,923,190.25/139,854
6. Step 6: Final answer
   x = 330,801.57