Finding the Fourth Proportional to 21,830.00, 30,128.65 and 13,337.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,830.00 : 30,128.65 = 13,337.02 : x
2. Step 2: Convert to fraction form
   21,830.00/30,128.65 = 13,337.02/x
3. Step 3: Cross multiply
   21,830.00x = 30,128.65 × 13,337.02
4. Step 4: Simplify right side
   21,830.00x = 401,826,486.96
5. Step 5: Solve for x
   x = 401,826,486.96/21,830.00
6. Step 6: Final answer
   x = 18,407.08