Finding the Fourth Proportional to 9,864.09, 13,612.56 and 5,387.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.09 : 13,612.56 = 5,387.88 : x
2. Step 2: Convert to fraction form
   9,864.09/13,612.56 = 5,387.88/x
3. Step 3: Cross multiply
   9,864.09x = 13,612.56 × 5,387.88
4. Step 4: Simplify right side
   9,864.09x = 73,342,839.77
5. Step 5: Solve for x
   x = 73,342,839.77/9,864.09
6. Step 6: Final answer
   x = 7,435.34