Finding the Fourth Proportional to 9,931.43, 13,705.46 and 5,455.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,931.43 : 13,705.46 = 5,455.28 : x
2. Step 2: Convert to fraction form
   9,931.43/13,705.46 = 5,455.28/x
3. Step 3: Cross multiply
   9,931.43x = 13,705.46 × 5,455.28
4. Step 4: Simplify right side
   9,931.43x = 74,767,026.03
5. Step 5: Solve for x
   x = 74,767,026.03/9,931.43
6. Step 6: Final answer
   x = 7,528.33