Finding the Fourth Proportional to 9,920.64, 13,690.82 and 5,444.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.64 : 13,690.82 = 5,444.40 : x
2. Step 2: Convert to fraction form
   9,920.64/13,690.82 = 5,444.40/x
3. Step 3: Cross multiply
   9,920.64x = 13,690.82 × 5,444.40
4. Step 4: Simplify right side
   9,920.64x = 74,538,300.41
5. Step 5: Solve for x
   x = 74,538,300.41/9,920.64
6. Step 6: Final answer
   x = 7,513.46