Finding the Fourth Proportional to 9,381.90, 12,944.88 and 5,402.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,381.90 : 12,944.88 = 5,402.28 : x
2. Step 2: Convert to fraction form
   9,381.90/12,944.88 = 5,402.28/x
3. Step 3: Cross multiply
   9,381.90x = 12,944.88 × 5,402.28
4. Step 4: Simplify right side
   9,381.90x = 69,931,866.33
5. Step 5: Solve for x
   x = 69,931,866.33/9,381.90
6. Step 6: Final answer
   x = 7,453.91