Finding the Fourth Proportional to 128,405.86, 192,327.92 and 65,116.91

Step by Step Solution

1. Step 1: Write the proportion equation
   128,405.86 : 192,327.92 = 65,116.91 : x
2. Step 2: Convert to fraction form
   128,405.86/192,327.92 = 65,116.91/x
3. Step 3: Cross multiply
   128,405.86x = 192,327.92 × 65,116.91
4. Step 4: Simplify right side
   128,405.86x = 12,523,800,256.55
5. Step 5: Solve for x
   x = 12,523,800,256.55/128,405.86
6. Step 6: Final answer
   x = 97,532.94