Finding the Fourth Proportional to 9,870.42, 13,620.93 and 5,394.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.42 : 13,620.93 = 5,394.18 : x
2. Step 2: Convert to fraction form
   9,870.42/13,620.93 = 5,394.18/x
3. Step 3: Cross multiply
   9,870.42x = 13,620.93 × 5,394.18
4. Step 4: Simplify right side
   9,870.42x = 73,473,748.19
5. Step 5: Solve for x
   x = 73,473,748.19/9,870.42
6. Step 6: Final answer
   x = 7,443.83