Finding the Fourth Proportional to 9,374.89, 12,937.35 and 5,396.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,374.89 : 12,937.35 = 5,396.78 : x
2. Step 2: Convert to fraction form
   9,374.89/12,937.35 = 5,396.78/x
3. Step 3: Cross multiply
   9,374.89x = 12,937.35 × 5,396.78
4. Step 4: Simplify right side
   9,374.89x = 69,819,987.28
5. Step 5: Solve for x
   x = 69,819,987.28/9,374.89
6. Step 6: Final answer
   x = 7,447.55