Finding the Fourth Proportional to 142,308.59, 196,378.16 and 78,642.27

Step by Step Solution

1. Step 1: Write the proportion equation
   142,308.59 : 196,378.16 = 78,642.27 : x
2. Step 2: Convert to fraction form
   142,308.59/196,378.16 = 78,642.27/x
3. Step 3: Cross multiply
   142,308.59x = 196,378.16 × 78,642.27
4. Step 4: Simplify right side
   142,308.59x = 15,443,623,887.61
5. Step 5: Solve for x
   x = 15,443,623,887.61/142,308.59
6. Step 6: Final answer
   x = 108,522.08