Finding the Fourth Proportional to 21,999.10, 32,990.55 and 10,902.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,999.10 : 32,990.55 = 10,902.10 : x
2. Step 2: Convert to fraction form
   21,999.10/32,990.55 = 10,902.10/x
3. Step 3: Cross multiply
   21,999.10x = 32,990.55 × 10,902.10
4. Step 4: Simplify right side
   21,999.10x = 359,666,275.16
5. Step 5: Solve for x
   x = 359,666,275.16/21,999.10
6. Step 6: Final answer
   x = 16,349.14