Finding the Fourth Proportional to 128,114.17, 192,289.38 and 64,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   128,114.17 : 192,289.38 = 64,978.60 : x
2. Step 2: Convert to fraction form
   128,114.17/192,289.38 = 64,978.60/x
3. Step 3: Cross multiply
   128,114.17x = 192,289.38 × 64,978.60
4. Step 4: Simplify right side
   128,114.17x = 12,494,694,707.27
5. Step 5: Solve for x
   x = 12,494,694,707.27/128,114.17
6. Step 6: Final answer
   x = 97,527.81