Finding the Fourth Proportional to 28,498.50, 42,748.62 and 9,778.27

Step by Step Solution

1. Step 1: Write the proportion equation
   28,498.50 : 42,748.62 = 9,778.27 : x
2. Step 2: Convert to fraction form
   28,498.50/42,748.62 = 9,778.27/x
3. Step 3: Cross multiply
   28,498.50x = 42,748.62 × 9,778.27
4. Step 4: Simplify right side
   28,498.50x = 418,007,548.49
5. Step 5: Solve for x
   x = 418,007,548.49/28,498.50
6. Step 6: Final answer
   x = 14,667.70