Finding the Fourth Proportional to 142,388.22, 196,480.71 and 78,715.74

Step by Step Solution

1. Step 1: Write the proportion equation
   142,388.22 : 196,480.71 = 78,715.74 : x
2. Step 2: Convert to fraction form
   142,388.22/196,480.71 = 78,715.74/x
3. Step 3: Cross multiply
   142,388.22x = 196,480.71 × 78,715.74
4. Step 4: Simplify right side
   142,388.22x = 15,466,124,483.38
5. Step 5: Solve for x
   x = 15,466,124,483.38/142,388.22
6. Step 6: Final answer
   x = 108,619.41