Finding the Fourth Proportional to 85,491.46, 128,199.50 and 45,500.79

Step by Step Solution

1. Step 1: Write the proportion equation
   85,491.46 : 128,199.50 = 45,500.79 : x
2. Step 2: Convert to fraction form
   85,491.46/128,199.50 = 45,500.79/x
3. Step 3: Cross multiply
   85,491.46x = 128,199.50 × 45,500.79
4. Step 4: Simplify right side
   85,491.46x = 5,833,178,951.48
5. Step 5: Solve for x
   x = 5,833,178,951.48/85,491.46
6. Step 6: Final answer
   x = 68,231.13