Finding the Fourth Proportional to 142,339.47, 196,411.60 and 78,666.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142,339.47 : 196,411.60 = 78,666.18 : x
2. Step 2: Convert to fraction form
   142,339.47/196,411.60 = 78,666.18/x
3. Step 3: Cross multiply
   142,339.47x = 196,411.60 × 78,666.18
4. Step 4: Simplify right side
   142,339.47x = 15,450,950,279.69
5. Step 5: Solve for x
   x = 15,450,950,279.69/142,339.47
6. Step 6: Final answer
   x = 108,550.01