Finding the Fourth Proportional to 143,087.72, 214,603.90 and 71,991.34

Step by Step Solution

1. Step 1: Write the proportion equation
   143,087.72 : 214,603.90 = 71,991.34 : x
2. Step 2: Convert to fraction form
   143,087.72/214,603.90 = 71,991.34/x
3. Step 3: Cross multiply
   143,087.72x = 214,603.90 × 71,991.34
4. Step 4: Simplify right side
   143,087.72x = 15,449,622,823.29
5. Step 5: Solve for x
   x = 15,449,622,823.29/143,087.72
6. Step 6: Final answer
   x = 107,973.09