Finding the Fourth Proportional to 142,111.26, 196,113.34 and 78,448.90

Step by Step Solution

1. Step 1: Write the proportion equation
   142,111.26 : 196,113.34 = 78,448.90 : x
2. Step 2: Convert to fraction form
   142,111.26/196,113.34 = 78,448.90/x
3. Step 3: Cross multiply
   142,111.26x = 196,113.34 × 78,448.90
4. Step 4: Simplify right side
   142,111.26x = 15,384,875,798.33
5. Step 5: Solve for x
   x = 15,384,875,798.33/142,111.26
6. Step 6: Final answer
   x = 108,259.37