Finding the Fourth Proportional to 328,238.50, 492,357.90 and 103,621.72

Step by Step Solution

1. Step 1: Write the proportion equation
   328,238.50 : 492,357.90 = 103,621.72 : x
2. Step 2: Convert to fraction form
   328,238.50/492,357.90 = 103,621.72/x
3. Step 3: Cross multiply
   328,238.50x = 492,357.90 × 103,621.72
4. Step 4: Simplify right side
   328,238.50x = 51,018,972,453.59
5. Step 5: Solve for x
   x = 51,018,972,453.59/328,238.50
6. Step 6: Final answer
   x = 155,432.63