Finding the Fourth Proportional to 128,592.56, 177,458.65 and 72,003.94

Step by Step Solution

1. Step 1: Write the proportion equation
   128,592.56 : 177,458.65 = 72,003.94 : x
2. Step 2: Convert to fraction form
   128,592.56/177,458.65 = 72,003.94/x
3. Step 3: Cross multiply
   128,592.56x = 177,458.65 × 72,003.94
4. Step 4: Simplify right side
   128,592.56x = 12,777,721,363.42
5. Step 5: Solve for x
   x = 12,777,721,363.42/128,592.56
6. Step 6: Final answer
   x = 99,365.94