Finding the Fourth Proportional to 308,658.69, 463,071.23 and 128,684.30

Step by Step Solution

1. Step 1: Write the proportion equation
   308,658.69 : 463,071.23 = 128,684.30 : x
2. Step 2: Convert to fraction form
   308,658.69/463,071.23 = 128,684.30/x
3. Step 3: Cross multiply
   308,658.69x = 463,071.23 × 128,684.30
4. Step 4: Simplify right side
   308,658.69x = 59,589,997,082.69
5. Step 5: Solve for x
   x = 59,589,997,082.69/308,658.69
6. Step 6: Final answer
   x = 193,061.14