Finding the Third Proportional to 356,139 and 554,632.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,139 : 554,632.50 = 554,632.50 : x
2. Step 2: Convert to fraction form
   356,139/554,632.50 = 554,632.50/x
3. Step 3: Cross multiply
   356,139x = 554,632.50 × 554,632.50
4. Step 4: Simplify right side
   356,139x = 307,617,210,056.25
5. Step 5: Solve for x
   x = 307,617,210,056.25/356,139
6. Step 6: Final answer
   x = 863,756.03