Finding the Fourth Proportional to 28,404, 42,405.67 and 21,705.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,404 : 42,405.67 = 21,705.12 : x
2. Step 2: Convert to fraction form
   28,404/42,405.67 = 21,705.12/x
3. Step 3: Cross multiply
   28,404x = 42,405.67 × 21,705.12
4. Step 4: Simplify right side
   28,404x = 920,420,101.77
5. Step 5: Solve for x
   x = 920,420,101.77/28,404
6. Step 6: Final answer
   x = 32,404.59