Finding the Third Proportional to 438,316 and 657,484.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,316 : 657,484.50 = 657,484.50 : x
2. Step 2: Convert to fraction form
   438,316/657,484.50 = 657,484.50/x
3. Step 3: Cross multiply
   438,316x = 657,484.50 × 657,484.50
4. Step 4: Simplify right side
   438,316x = 432,285,867,740.25
5. Step 5: Solve for x
   x = 432,285,867,740.25/438,316
6. Step 6: Final answer
   x = 986,242.50