Finding the Third Proportional to 129,700 and 284,003.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,700 : 284,003.50 = 284,003.50 : x
2. Step 2: Convert to fraction form
   129,700/284,003.50 = 284,003.50/x
3. Step 3: Cross multiply
   129,700x = 284,003.50 × 284,003.50
4. Step 4: Simplify right side
   129,700x = 80,657,988,012.25
5. Step 5: Solve for x
   x = 80,657,988,012.25/129,700
6. Step 6: Final answer
   x = 621,881.17