Finding the Fourth Proportional to 103,405.20, 142,662.82 and 67,616.16

Step by Step Solution

1. Step 1: Write the proportion equation
   103,405.20 : 142,662.82 = 67,616.16 : x
2. Step 2: Convert to fraction form
   103,405.20/142,662.82 = 67,616.16/x
3. Step 3: Cross multiply
   103,405.20x = 142,662.82 × 67,616.16
4. Step 4: Simplify right side
   103,405.20x = 9,646,312,063.17
5. Step 5: Solve for x
   x = 9,646,312,063.17/103,405.20
6. Step 6: Final answer
   x = 93,286.53