Finding the Third Proportional to 144,818 and 315,381.38

Step by Step Solution

1. Step 1: Write the proportion equation
   144,818 : 315,381.38 = 315,381.38 : x
2. Step 2: Convert to fraction form
   144,818/315,381.38 = 315,381.38/x
3. Step 3: Cross multiply
   144,818x = 315,381.38 × 315,381.38
4. Step 4: Simplify right side
   144,818x = 99,465,411,696.89
5. Step 5: Solve for x
   x = 99,465,411,696.89/144,818
6. Step 6: Final answer
   x = 686,830.45