Finding the Fourth Proportional to 21,499.76, 29,670.20 and 12,069.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499.76 : 29,670.20 = 12,069.04 : x
2. Step 2: Convert to fraction form
   21,499.76/29,670.20 = 12,069.04/x
3. Step 3: Cross multiply
   21,499.76x = 29,670.20 × 12,069.04
4. Step 4: Simplify right side
   21,499.76x = 358,090,830.61
5. Step 5: Solve for x
   x = 358,090,830.61/21,499.76
6. Step 6: Final answer
   x = 16,655.57