Finding the Fourth Proportional to 157,389.72, 215,975.91 and 143,133.72

Step by Step Solution

1. Step 1: Write the proportion equation
   157,389.72 : 215,975.91 = 143,133.72 : x
2. Step 2: Convert to fraction form
   157,389.72/215,975.91 = 143,133.72/x
3. Step 3: Cross multiply
   157,389.72x = 215,975.91 × 143,133.72
4. Step 4: Simplify right side
   157,389.72x = 30,913,435,428.69
5. Step 5: Solve for x
   x = 30,913,435,428.69/157,389.72
6. Step 6: Final answer
   x = 196,413.31