Finding the Fourth Proportional to 261,005.56, 391,508.58 and 64,013.56

Step by Step Solution

1. Step 1: Write the proportion equation
   261,005.56 : 391,508.58 = 64,013.56 : x
2. Step 2: Convert to fraction form
   261,005.56/391,508.58 = 64,013.56/x
3. Step 3: Cross multiply
   261,005.56x = 391,508.58 × 64,013.56
4. Step 4: Simplify right side
   261,005.56x = 25,061,857,976.34
5. Step 5: Solve for x
   x = 25,061,857,976.34/261,005.56
6. Step 6: Final answer
   x = 96,020.40