Finding the Fourth Proportional to 9,881.33, 13,636.58 and 5,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,881.33 : 13,636.58 = 5,405.40 : x
2. Step 2: Convert to fraction form
   9,881.33/13,636.58 = 5,405.40/x
3. Step 3: Cross multiply
   9,881.33x = 13,636.58 × 5,405.40
4. Step 4: Simplify right side
   9,881.33x = 73,711,142.51
5. Step 5: Solve for x
   x = 73,711,142.51/9,881.33
6. Step 6: Final answer
   x = 7,459.64