Finding the Fourth Proportional to 21,681.60, 32,498.88 and 7,636.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681.60 : 32,498.88 = 7,636.16 : x
2. Step 2: Convert to fraction form
   21,681.60/32,498.88 = 7,636.16/x
3. Step 3: Cross multiply
   21,681.60x = 32,498.88 × 7,636.16
4. Step 4: Simplify right side
   21,681.60x = 248,166,647.50
5. Step 5: Solve for x
   x = 248,166,647.50/21,681.60
6. Step 6: Final answer
   x = 11,445.96