Finding the Fourth Proportional to 28,012.50, 42,003.90 and 8,288.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,012.50 : 42,003.90 = 8,288.34 : x
2. Step 2: Convert to fraction form
   28,012.50/42,003.90 = 8,288.34/x
3. Step 3: Cross multiply
   28,012.50x = 42,003.90 × 8,288.34
4. Step 4: Simplify right side
   28,012.50x = 348,142,604.53
5. Step 5: Solve for x
   x = 348,142,604.53/28,012.50
6. Step 6: Final answer
   x = 12,428.12