Finding the Third Proportional to 139,854.88 and 215,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,854.88 : 215,091.50 = 215,091.50 : x
2. Step 2: Convert to fraction form
   139,854.88/215,091.50 = 215,091.50/x
3. Step 3: Cross multiply
   139,854.88x = 215,091.50 × 215,091.50
4. Step 4: Simplify right side
   139,854.88x = 46,264,353,372.25
5. Step 5: Solve for x
   x = 46,264,353,372.25/139,854.88
6. Step 6: Final answer
   x = 330,802.58