Finding the Fourth Proportional to 9,886.01, 13,642.28 and 5,909.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.01 : 13,642.28 = 5,909.31 : x
2. Step 2: Convert to fraction form
   9,886.01/13,642.28 = 5,909.31/x
3. Step 3: Cross multiply
   9,886.01x = 13,642.28 × 5,909.31
4. Step 4: Simplify right side
   9,886.01x = 80,616,432.08
5. Step 5: Solve for x
   x = 80,616,432.08/9,886.01
6. Step 6: Final answer
   x = 8,154.60