Finding the Fourth Proportional to 328,198.56, 492,297.72 and 78,880.56

Step by Step Solution

1. Step 1: Write the proportion equation
   328,198.56 : 492,297.72 = 78,880.56 : x
2. Step 2: Convert to fraction form
   328,198.56/492,297.72 = 78,880.56/x
3. Step 3: Cross multiply
   328,198.56x = 492,297.72 × 78,880.56
4. Step 4: Simplify right side
   328,198.56x = 38,832,719,840.32
5. Step 5: Solve for x
   x = 38,832,719,840.32/328,198.56
6. Step 6: Final answer
   x = 118,320.81