Finding the Fourth Proportional to 128,621.37, 177,499.94 and 72,032.61

Step by Step Solution

1. Step 1: Write the proportion equation
   128,621.37 : 177,499.94 = 72,032.61 : x
2. Step 2: Convert to fraction form
   128,621.37/177,499.94 = 72,032.61/x
3. Step 3: Cross multiply
   128,621.37x = 177,499.94 × 72,032.61
4. Step 4: Simplify right side
   128,621.37x = 12,785,783,592.88
5. Step 5: Solve for x
   x = 12,785,783,592.88/128,621.37
6. Step 6: Final answer
   x = 99,406.37