Finding the Fourth Proportional to 21,686.35, 32,541.83 and 9,999.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,686.35 : 32,541.83 = 9,999.57 : x
2. Step 2: Convert to fraction form
   21,686.35/32,541.83 = 9,999.57/x
3. Step 3: Cross multiply
   21,686.35x = 32,541.83 × 9,999.57
4. Step 4: Simplify right side
   21,686.35x = 325,404,307.01
5. Step 5: Solve for x
   x = 325,404,307.01/21,686.35
6. Step 6: Final answer
   x = 15,005.03