Finding the Third Proportional to 318,665,382.19 and 685,758,340.69

Step by Step Solution

1. Step 1: Write the proportion equation
   318,665,382.19 : 685,758,340.69 = 685,758,340.69 : x
2. Step 2: Convert to fraction form
   318,665,382.19/685,758,340.69 = 685,758,340.69/x
3. Step 3: Cross multiply
   318,665,382.19x = 685,758,340.69 × 685,758,340.69
4. Step 4: Simplify right side
   318,665,382.19x = 470,264,501,822,473,344
5. Step 5: Solve for x
   x = 470,264,501,822,473,344/318,665,382.19
6. Step 6: Final answer
   x = 1,475,731,372.50