Finding the Fourth Proportional to 210,426.54, 315,642.69 and 70,185.30

Step by Step Solution

1. Step 1: Write the proportion equation
   210,426.54 : 315,642.69 = 70,185.30 : x
2. Step 2: Convert to fraction form
   210,426.54/315,642.69 = 70,185.30/x
3. Step 3: Cross multiply
   210,426.54x = 315,642.69 × 70,185.30
4. Step 4: Simplify right side
   210,426.54x = 22,153,476,890.46
5. Step 5: Solve for x
   x = 22,153,476,890.46/210,426.54
6. Step 6: Final answer
   x = 105,278.91