Finding the Fourth Proportional to 142,577.58, 196,758.81 and 78,921.30

Step by Step Solution

1. Step 1: Write the proportion equation
   142,577.58 : 196,758.81 = 78,921.30 : x
2. Step 2: Convert to fraction form
   142,577.58/196,758.81 = 78,921.30/x
3. Step 3: Cross multiply
   142,577.58x = 196,758.81 × 78,921.30
4. Step 4: Simplify right side
   142,577.58x = 15,528,461,071.65
5. Step 5: Solve for x
   x = 15,528,461,071.65/142,577.58
6. Step 6: Final answer
   x = 108,912.36