Finding the Fourth Proportional to 128,735.82, 177,662.72 and 72,150.84

Step by Step Solution

1. Step 1: Write the proportion equation
   128,735.82 : 177,662.72 = 72,150.84 : x
2. Step 2: Convert to fraction form
   128,735.82/177,662.72 = 72,150.84/x
3. Step 3: Cross multiply
   128,735.82x = 177,662.72 × 72,150.84
4. Step 4: Simplify right side
   128,735.82x = 12,818,514,123.93
5. Step 5: Solve for x
   x = 12,818,514,123.93/128,735.82
6. Step 6: Final answer
   x = 99,572.24