Finding the Fourth Proportional to 9,920.10, 13,689.70 and 5,443.93

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.10 : 13,689.70 = 5,443.93 : x
2. Step 2: Convert to fraction form
   9,920.10/13,689.70 = 5,443.93/x
3. Step 3: Cross multiply
   9,920.10x = 13,689.70 × 5,443.93
4. Step 4: Simplify right side
   9,920.10x = 74,525,802.65
5. Step 5: Solve for x
   x = 74,525,802.65/9,920.10
6. Step 6: Final answer
   x = 7,512.60