Finding the Fourth Proportional to 7,641.12, 10,549.78 and 5,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,641.12 : 10,549.78 = 5,290.50 : x
2. Step 2: Convert to fraction form
   7,641.12/10,549.78 = 5,290.50/x
3. Step 3: Cross multiply
   7,641.12x = 10,549.78 × 5,290.50
4. Step 4: Simplify right side
   7,641.12x = 55,813,611.09
5. Step 5: Solve for x
   x = 55,813,611.09/7,641.12
6. Step 6: Final answer
   x = 7,304.38