Finding the Fourth Proportional to 308,870.15, 426,249.74 and 172,903.28

Step by Step Solution

1. Step 1: Write the proportion equation
   308,870.15 : 426,249.74 = 172,903.28 : x
2. Step 2: Convert to fraction form
   308,870.15/426,249.74 = 172,903.28/x
3. Step 3: Cross multiply
   308,870.15x = 426,249.74 × 172,903.28
4. Step 4: Simplify right side
   308,870.15x = 73,699,976,446.16
5. Step 5: Solve for x
   x = 73,699,976,446.16/308,870.15
6. Step 6: Final answer
   x = 238,611.53