Finding the Fourth Proportional to 9,379.57, 12,945.39 and 5,402.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,379.57 : 12,945.39 = 5,402.98 : x
2. Step 2: Convert to fraction form
   9,379.57/12,945.39 = 5,402.98/x
3. Step 3: Cross multiply
   9,379.57x = 12,945.39 × 5,402.98
4. Step 4: Simplify right side
   9,379.57x = 69,943,683.26
5. Step 5: Solve for x
   x = 69,943,683.26/9,379.57
6. Step 6: Final answer
   x = 7,457.02