Finding the Fourth Proportional to 9,886.86, 13,642.83 and 5,637.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.86 : 13,642.83 = 5,637.60 : x
2. Step 2: Convert to fraction form
   9,886.86/13,642.83 = 5,637.60/x
3. Step 3: Cross multiply
   9,886.86x = 13,642.83 × 5,637.60
4. Step 4: Simplify right side
   9,886.86x = 76,912,818.41
5. Step 5: Solve for x
   x = 76,912,818.41/9,886.86
6. Step 6: Final answer
   x = 7,779.30