Finding the Fourth Proportional to 85,404.37, 128,184.30 and 45,456.89

Step by Step Solution

1. Step 1: Write the proportion equation
   85,404.37 : 128,184.30 = 45,456.89 : x
2. Step 2: Convert to fraction form
   85,404.37/128,184.30 = 45,456.89/x
3. Step 3: Cross multiply
   85,404.37x = 128,184.30 × 45,456.89
4. Step 4: Simplify right side
   85,404.37x = 5,826,859,624.83
5. Step 5: Solve for x
   x = 5,826,859,624.83/85,404.37
6. Step 6: Final answer
   x = 68,226.72