Finding the Fourth Proportional to 142,320.08, 196,398.72 and 78,656.48

Step by Step Solution

1. Step 1: Write the proportion equation
   142,320.08 : 196,398.72 = 78,656.48 : x
2. Step 2: Convert to fraction form
   142,320.08/196,398.72 = 78,656.48/x
3. Step 3: Cross multiply
   142,320.08x = 196,398.72 × 78,656.48
4. Step 4: Simplify right side
   142,320.08x = 15,448,031,991.71
5. Step 5: Solve for x
   x = 15,448,031,991.71/142,320.08
6. Step 6: Final answer
   x = 108,544.29