Finding the Fourth Proportional to 142,989.91, 197,328.69 and 78,462.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,989.91 : 197,328.69 = 78,462.47 : x
2. Step 2: Convert to fraction form
   142,989.91/197,328.69 = 78,462.47/x
3. Step 3: Cross multiply
   142,989.91x = 197,328.69 × 78,462.47
4. Step 4: Simplify right side
   142,989.91x = 15,482,896,912.59
5. Step 5: Solve for x
   x = 15,482,896,912.59/142,989.91
6. Step 6: Final answer
   x = 108,279.65