Finding the Fourth Proportional to 9,870.29, 13,620.42 and 5,393.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.29 : 13,620.42 = 5,393.15 : x
2. Step 2: Convert to fraction form
   9,870.29/13,620.42 = 5,393.15/x
3. Step 3: Cross multiply
   9,870.29x = 13,620.42 × 5,393.15
4. Step 4: Simplify right side
   9,870.29x = 73,456,968.12
5. Step 5: Solve for x
   x = 73,456,968.12/9,870.29
6. Step 6: Final answer
   x = 7,442.23