Finding the Fourth Proportional to 85,693.98, 128,559.72 and 25,719.96

Step by Step Solution

1. Step 1: Write the proportion equation
   85,693.98 : 128,559.72 = 25,719.96 : x
2. Step 2: Convert to fraction form
   85,693.98/128,559.72 = 25,719.96/x
3. Step 3: Cross multiply
   85,693.98x = 128,559.72 × 25,719.96
4. Step 4: Simplify right side
   85,693.98x = 3,306,550,856.01
5. Step 5: Solve for x
   x = 3,306,550,856.01/85,693.98
6. Step 6: Final answer
   x = 38,585.57