Finding the Fourth Proportional to 142,068.63, 196,048.98 and 78,405.60

Step by Step Solution

1. Step 1: Write the proportion equation
   142,068.63 : 196,048.98 = 78,405.60 : x
2. Step 2: Convert to fraction form
   142,068.63/196,048.98 = 78,405.60/x
3. Step 3: Cross multiply
   142,068.63x = 196,048.98 × 78,405.60
4. Step 4: Simplify right side
   142,068.63x = 15,371,337,906.29
5. Step 5: Solve for x
   x = 15,371,337,906.29/142,068.63
6. Step 6: Final answer
   x = 108,196.57