Finding the Fourth Proportional to 128,952.69, 177,967.49 and 72,364.29

Step by Step Solution

1. Step 1: Write the proportion equation
   128,952.69 : 177,967.49 = 72,364.29 : x
2. Step 2: Convert to fraction form
   128,952.69/177,967.49 = 72,364.29/x
3. Step 3: Cross multiply
   128,952.69x = 177,967.49 × 72,364.29
4. Step 4: Simplify right side
   128,952.69x = 12,878,490,348.01
5. Step 5: Solve for x
   x = 12,878,490,348.01/128,952.69
6. Step 6: Final answer
   x = 99,869.89