Finding the Fourth Proportional to 9,957.42, 13,740.98 and 5,419.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,957.42 : 13,740.98 = 5,419.98 : x
2. Step 2: Convert to fraction form
   9,957.42/13,740.98 = 5,419.98/x
3. Step 3: Cross multiply
   9,957.42x = 13,740.98 × 5,419.98
4. Step 4: Simplify right side
   9,957.42x = 74,475,836.78
5. Step 5: Solve for x
   x = 74,475,836.78/9,957.42
6. Step 6: Final answer
   x = 7,479.43