Finding the Fourth Proportional to 128,405.52, 177,196.68 and 71,822.16

Step by Step Solution

1. Step 1: Write the proportion equation
   128,405.52 : 177,196.68 = 71,822.16 : x
2. Step 2: Convert to fraction form
   128,405.52/177,196.68 = 71,822.16/x
3. Step 3: Cross multiply
   128,405.52x = 177,196.68 × 71,822.16
4. Step 4: Simplify right side
   128,405.52x = 12,726,648,302.43
5. Step 5: Solve for x
   x = 12,726,648,302.43/128,405.52
6. Step 6: Final answer
   x = 99,112.94