Finding the Fourth Proportional to 28,209.40, 42,300.42 and 8,484.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,209.40 : 42,300.42 = 8,484.28 : x
2. Step 2: Convert to fraction form
   28,209.40/42,300.42 = 8,484.28/x
3. Step 3: Cross multiply
   28,209.40x = 42,300.42 × 8,484.28
4. Step 4: Simplify right side
   28,209.40x = 358,888,607.40
5. Step 5: Solve for x
   x = 358,888,607.40/28,209.40
6. Step 6: Final answer
   x = 12,722.31