Finding the Fourth Proportional to 143,735.98, 196,919 and 138,348.87

Step by Step Solution

1. Step 1: Write the proportion equation
   143,735.98 : 196,919 = 138,348.87 : x
2. Step 2: Convert to fraction form
   143,735.98/196,919 = 138,348.87/x
3. Step 3: Cross multiply
   143,735.98x = 196,919 × 138,348.87
4. Step 4: Simplify right side
   143,735.98x = 27,243,521,131.53
5. Step 5: Solve for x
   x = 27,243,521,131.53/143,735.98
6. Step 6: Final answer
   x = 189,538.63