Finding the Fourth Proportional to 15,483.30, 21,365.01 and 12,820.02

Step by Step Solution

1. Step 1: Write the proportion equation
   15,483.30 : 21,365.01 = 12,820.02 : x
2. Step 2: Convert to fraction form
   15,483.30/21,365.01 = 12,820.02/x
3. Step 3: Cross multiply
   15,483.30x = 21,365.01 × 12,820.02
4. Step 4: Simplify right side
   15,483.30x = 273,899,855.50
5. Step 5: Solve for x
   x = 273,899,855.50/15,483.30
6. Step 6: Final answer
   x = 17,690.02