Finding the Fourth Proportional to 21,499.86, 29,676 and 13,002

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.86 : 29,676 = 13,002 : x
2. Step 2: Convert to fraction form
   21,499.86/29,676 = 13,002/x
3. Step 3: Cross multiply
   21,499.86x = 29,676 × 13,002
4. Step 4: Simplify right side
   21,499.86x = 385,847,352
5. Step 5: Solve for x
   x = 385,847,352/21,499.86
6. Step 6: Final answer
   x = 17,946.51