Finding the Fourth Proportional to 142,653.59, 196,859.55 and 78,990.02

Step by Step Solution

1. Step 1: Write the proportion equation
   142,653.59 : 196,859.55 = 78,990.02 : x
2. Step 2: Convert to fraction form
   142,653.59/196,859.55 = 78,990.02/x
3. Step 3: Cross multiply
   142,653.59x = 196,859.55 × 78,990.02
4. Step 4: Simplify right side
   142,653.59x = 15,549,939,791.69
5. Step 5: Solve for x
   x = 15,549,939,791.69/142,653.59
6. Step 6: Final answer
   x = 109,004.90