Finding the Fourth Proportional to 143,212, 197,632.67 and 78,685.39

Step by Step Solution

1. Step 1: Write the proportion equation
   143,212 : 197,632.67 = 78,685.39 : x
2. Step 2: Convert to fraction form
   143,212/197,632.67 = 78,685.39/x
3. Step 3: Cross multiply
   143,212x = 197,632.67 × 78,685.39
4. Step 4: Simplify right side
   143,212x = 15,550,803,715.69
5. Step 5: Solve for x
   x = 15,550,803,715.69/143,212
6. Step 6: Final answer
   x = 108,585.90