Finding the Fourth Proportional to 9,856.91, 13,602.01 and 5,379.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.91 : 13,602.01 = 5,379.79 : x
2. Step 2: Convert to fraction form
   9,856.91/13,602.01 = 5,379.79/x
3. Step 3: Cross multiply
   9,856.91x = 13,602.01 × 5,379.79
4. Step 4: Simplify right side
   9,856.91x = 73,175,960.64
5. Step 5: Solve for x
   x = 73,175,960.64/9,856.91
6. Step 6: Final answer
   x = 7,423.83