Finding the Fourth Proportional to 21,430.55, 32,150.42 and 10,902.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,430.55 : 32,150.42 = 10,902.04 : x
2. Step 2: Convert to fraction form
   21,430.55/32,150.42 = 10,902.04/x
3. Step 3: Cross multiply
   21,430.55x = 32,150.42 × 10,902.04
4. Step 4: Simplify right side
   21,430.55x = 350,505,164.86
5. Step 5: Solve for x
   x = 350,505,164.86/21,430.55
6. Step 6: Final answer
   x = 16,355.40