Finding the Third Proportional to 311,178 and 633,769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,178 : 633,769.50 = 633,769.50 : x
2. Step 2: Convert to fraction form
   311,178/633,769.50 = 633,769.50/x
3. Step 3: Cross multiply
   311,178x = 633,769.50 × 633,769.50
4. Step 4: Simplify right side
   311,178x = 401,663,779,130.25
5. Step 5: Solve for x
   x = 401,663,779,130.25/311,178
6. Step 6: Final answer
   x = 1,290,784.63