Finding the Fourth Proportional to 78,428.39, 117,630.23 and 65,186.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,428.39 : 117,630.23 = 65,186.42 : x
2. Step 2: Convert to fraction form
   78,428.39/117,630.23 = 65,186.42/x
3. Step 3: Cross multiply
   78,428.39x = 117,630.23 × 65,186.42
4. Step 4: Simplify right side
   78,428.39x = 7,667,893,152.29
5. Step 5: Solve for x
   x = 7,667,893,152.29/78,428.39
6. Step 6: Final answer
   x = 97,769.35