Finding the Third Proportional to 212,003 and 286,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,003 : 286,900.50 = 286,900.50 : x
2. Step 2: Convert to fraction form
   212,003/286,900.50 = 286,900.50/x
3. Step 3: Cross multiply
   212,003x = 286,900.50 × 286,900.50
4. Step 4: Simplify right side
   212,003x = 82,311,896,900.25
5. Step 5: Solve for x
   x = 82,311,896,900.25/212,003
6. Step 6: Final answer
   x = 388,258.17