Finding the Fourth Proportional to 9,870.51, 13,621.59 and 5,394.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.51 : 13,621.59 = 5,394.45 : x
2. Step 2: Convert to fraction form
   9,870.51/13,621.59 = 5,394.45/x
3. Step 3: Cross multiply
   9,870.51x = 13,621.59 × 5,394.45
4. Step 4: Simplify right side
   9,870.51x = 73,480,986.18
5. Step 5: Solve for x
   x = 73,480,986.18/9,870.51
6. Step 6: Final answer
   x = 7,444.50