Finding the Fourth Proportional to 128,362.32, 177,147 and 71,772.48

Step by Step Solution

1. Step 1: Write the proportion equation
   128,362.32 : 177,147 = 71,772.48 : x
2. Step 2: Convert to fraction form
   128,362.32/177,147 = 71,772.48/x
3. Step 3: Cross multiply
   128,362.32x = 177,147 × 71,772.48
4. Step 4: Simplify right side
   128,362.32x = 12,714,279,514.56
5. Step 5: Solve for x
   x = 12,714,279,514.56/128,362.32
6. Step 6: Final answer
   x = 99,049.94