Finding the Fourth Proportional to 28,404, 39,182.61 and 21,677.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,404 : 39,182.61 = 21,677.91 : x
2. Step 2: Convert to fraction form
   28,404/39,182.61 = 21,677.91/x
3. Step 3: Cross multiply
   28,404x = 39,182.61 × 21,677.91
4. Step 4: Simplify right side
   28,404x = 849,397,093.15
5. Step 5: Solve for x
   x = 849,397,093.15/28,404
6. Step 6: Final answer
   x = 29,904.14