Finding the Third Proportional to 178,812 and 390,840.75

Step by Step Solution

1. Step 1: Write the proportion equation
   178,812 : 390,840.75 = 390,840.75 : x
2. Step 2: Convert to fraction form
   178,812/390,840.75 = 390,840.75/x
3. Step 3: Cross multiply
   178,812x = 390,840.75 × 390,840.75
4. Step 4: Simplify right side
   178,812x = 152,756,491,860.56
5. Step 5: Solve for x
   x = 152,756,491,860.56/178,812
6. Step 6: Final answer
   x = 854,285.46