Finding the Fourth Proportional to 9,961.57, 13,746.97 and 5,485.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.57 : 13,746.97 = 5,485.31 : x
2. Step 2: Convert to fraction form
   9,961.57/13,746.97 = 5,485.31/x
3. Step 3: Cross multiply
   9,961.57x = 13,746.97 × 5,485.31
4. Step 4: Simplify right side
   9,961.57x = 75,406,397.17
5. Step 5: Solve for x
   x = 75,406,397.17/9,961.57
6. Step 6: Final answer
   x = 7,569.73