Finding the Fourth Proportional to 9,870.50, 13,621.29 and 5,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.50 : 13,621.29 = 5,454.50 : x
2. Step 2: Convert to fraction form
   9,870.50/13,621.29 = 5,454.50/x
3. Step 3: Cross multiply
   9,870.50x = 13,621.29 × 5,454.50
4. Step 4: Simplify right side
   9,870.50x = 74,297,326.31
5. Step 5: Solve for x
   x = 74,297,326.31/9,870.50
6. Step 6: Final answer
   x = 7,527.21