Finding the Fourth Proportional to 9,380.68, 12,945.34 and 5,402.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.68 : 12,945.34 = 5,402.56 : x
2. Step 2: Convert to fraction form
   9,380.68/12,945.34 = 5,402.56/x
3. Step 3: Cross multiply
   9,380.68x = 12,945.34 × 5,402.56
4. Step 4: Simplify right side
   9,380.68x = 69,937,976.07
5. Step 5: Solve for x
   x = 69,937,976.07/9,380.68
6. Step 6: Final answer
   x = 7,455.53