Finding the Fourth Proportional to 142,314.77, 196,386.68 and 78,648.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,314.77 : 196,386.68 = 78,648.47 : x
2. Step 2: Convert to fraction form
   142,314.77/196,386.68 = 78,648.47/x
3. Step 3: Cross multiply
   142,314.77x = 196,386.68 × 78,648.47
4. Step 4: Simplify right side
   142,314.77x = 15,445,511,419.12
5. Step 5: Solve for x
   x = 15,445,511,419.12/142,314.77
6. Step 6: Final answer
   x = 108,530.63