Finding the Fourth Proportional to 216,435.85, 298,722.56 and 142,718.53

Step by Step Solution

1. Step 1: Write the proportion equation
   216,435.85 : 298,722.56 = 142,718.53 : x
2. Step 2: Convert to fraction form
   216,435.85/298,722.56 = 142,718.53/x
3. Step 3: Cross multiply
   216,435.85x = 298,722.56 × 142,718.53
4. Step 4: Simplify right side
   216,435.85x = 42,633,244,982.30
5. Step 5: Solve for x
   x = 42,633,244,982.30/216,435.85
6. Step 6: Final answer
   x = 196,978.67