Finding the Fourth Proportional to 85,815.56, 128,742.72 and 30,411.56

Step by Step Solution

1. Step 1: Write the proportion equation
   85,815.56 : 128,742.72 = 30,411.56 : x
2. Step 2: Convert to fraction form
   85,815.56/128,742.72 = 30,411.56/x
3. Step 3: Cross multiply
   85,815.56x = 128,742.72 × 30,411.56
4. Step 4: Simplify right side
   85,815.56x = 3,915,266,953.84
5. Step 5: Solve for x
   x = 3,915,266,953.84/85,815.56
6. Step 6: Final answer
   x = 45,624.21