Finding the Fourth Proportional to 128,949.34, 177,953.61 and 72,364.18

Step by Step Solution

1. Step 1: Write the proportion equation
   128,949.34 : 177,953.61 = 72,364.18 : x
2. Step 2: Convert to fraction form
   128,949.34/177,953.61 = 72,364.18/x
3. Step 3: Cross multiply
   128,949.34x = 177,953.61 × 72,364.18
4. Step 4: Simplify right side
   128,949.34x = 12,877,467,065.69
5. Step 5: Solve for x
   x = 12,877,467,065.69/128,949.34
6. Step 6: Final answer
   x = 99,864.54