Finding the Fourth Proportional to 9,961.66, 13,746.98 and 5,485.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.66 : 13,746.98 = 5,485.30 : x
2. Step 2: Convert to fraction form
   9,961.66/13,746.98 = 5,485.30/x
3. Step 3: Cross multiply
   9,961.66x = 13,746.98 × 5,485.30
4. Step 4: Simplify right side
   9,961.66x = 75,406,309.39
5. Step 5: Solve for x
   x = 75,406,309.39/9,961.66
6. Step 6: Final answer
   x = 7,569.65