Finding the Fourth Proportional to 9,381.70, 12,945.04 and 5,402.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.70 : 12,945.04 = 5,402.58 : x
2. Step 2: Convert to fraction form
   9,381.70/12,945.04 = 5,402.58/x
3. Step 3: Cross multiply
   9,381.70x = 12,945.04 × 5,402.58
4. Step 4: Simplify right side
   9,381.70x = 69,936,614.20
5. Step 5: Solve for x
   x = 69,936,614.20/9,381.70
6. Step 6: Final answer
   x = 7,454.58