Finding the Fourth Proportional to 85,679.72, 128,577.72 and 30,275.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,679.72 : 128,577.72 = 30,275.72 : x
2. Step 2: Convert to fraction form
   85,679.72/128,577.72 = 30,275.72/x
3. Step 3: Cross multiply
   85,679.72x = 128,577.72 × 30,275.72
4. Step 4: Simplify right side
   85,679.72x = 3,892,783,048.96
5. Step 5: Solve for x
   x = 3,892,783,048.96/85,679.72
6. Step 6: Final answer
   x = 45,434.12