Finding the Fourth Proportional to 128,932.82, 177,930.36 and 72,348.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,932.82 : 177,930.36 = 72,348.38 : x
2. Step 2: Convert to fraction form
   128,932.82/177,930.36 = 72,348.38/x
3. Step 3: Cross multiply
   128,932.82x = 177,930.36 × 72,348.38
4. Step 4: Simplify right side
   128,932.82x = 12,872,973,298.82
5. Step 5: Solve for x
   x = 12,872,973,298.82/128,932.82
6. Step 6: Final answer
   x = 99,842.49