Finding the Fourth Proportional to 9,421.98, 13,001.40 and 5,442.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,421.98 : 13,001.40 = 5,442.78 : x
2. Step 2: Convert to fraction form
   9,421.98/13,001.40 = 5,442.78/x
3. Step 3: Cross multiply
   9,421.98x = 13,001.40 × 5,442.78
4. Step 4: Simplify right side
   9,421.98x = 70,763,759.89
5. Step 5: Solve for x
   x = 70,763,759.89/9,421.98
6. Step 6: Final answer
   x = 7,510.50