Finding the Third Proportional to 147,078 and 311,490

Step by Step Solution

1. Step 1: Write the proportion equation
   147,078 : 311,490 = 311,490 : x
2. Step 2: Convert to fraction form
   147,078/311,490 = 311,490/x
3. Step 3: Cross multiply
   147,078x = 311,490 × 311,490
4. Step 4: Simplify right side
   147,078x = 97,026,020,100
5. Step 5: Solve for x
   x = 97,026,020,100/147,078
6. Step 6: Final answer
   x = 659,690.91