Finding the Fourth Proportional to 28,498.47, 42,748.58 and 9,778.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,498.47 : 42,748.58 = 9,778.25 : x
2. Step 2: Convert to fraction form
   28,498.47/42,748.58 = 9,778.25/x
3. Step 3: Cross multiply
   28,498.47x = 42,748.58 × 9,778.25
4. Step 4: Simplify right side
   28,498.47x = 418,006,302.39
5. Step 5: Solve for x
   x = 418,006,302.39/28,498.47
6. Step 6: Final answer
   x = 14,667.68