Finding the Third Proportional to 78,990 and 175,476

Step by Step Solution

1. Step 1: Write the proportion equation
   78,990 : 175,476 = 175,476 : x
2. Step 2: Convert to fraction form
   78,990/175,476 = 175,476/x
3. Step 3: Cross multiply
   78,990x = 175,476 × 175,476
4. Step 4: Simplify right side
   78,990x = 30,791,826,576
5. Step 5: Solve for x
   x = 30,791,826,576/78,990
6. Step 6: Final answer
   x = 389,819.30