Finding the Third Proportional to 210,373.50 and 287,415

Step by Step Solution

1. Step 1: Write the proportion equation
   210,373.50 : 287,415 = 287,415 : x
2. Step 2: Convert to fraction form
   210,373.50/287,415 = 287,415/x
3. Step 3: Cross multiply
   210,373.50x = 287,415 × 287,415
4. Step 4: Simplify right side
   210,373.50x = 82,607,382,225
5. Step 5: Solve for x
   x = 82,607,382,225/210,373.50
6. Step 6: Final answer
   x = 392,670.09