Finding the Fourth Proportional to 145,275.96, 218,280.42 and 139,371.32

Step by Step Solution

1. Step 1: Write the proportion equation
   145,275.96 : 218,280.42 = 139,371.32 : x
2. Step 2: Convert to fraction form
   145,275.96/218,280.42 = 139,371.32/x
3. Step 3: Cross multiply
   145,275.96x = 218,280.42 × 139,371.32
4. Step 4: Simplify right side
   145,275.96x = 30,422,030,265.55
5. Step 5: Solve for x
   x = 30,422,030,265.55/145,275.96
6. Step 6: Final answer
   x = 209,408.56