Finding the Fourth Proportional to 128,864.53, 177,835.13 and 72,274.69

Step by Step Solution

1. Step 1: Write the proportion equation
   128,864.53 : 177,835.13 = 72,274.69 : x
2. Step 2: Convert to fraction form
   128,864.53/177,835.13 = 72,274.69/x
3. Step 3: Cross multiply
   128,864.53x = 177,835.13 × 72,274.69
4. Step 4: Simplify right side
   128,864.53x = 12,852,978,891.86
5. Step 5: Solve for x
   x = 12,852,978,891.86/128,864.53
6. Step 6: Final answer
   x = 99,740.24