Finding the Fourth Proportional to 9,428.60, 14,142.18 and 3,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,428.60 : 14,142.18 = 3,188.72 : x
2. Step 2: Convert to fraction form
   9,428.60/14,142.18 = 3,188.72/x
3. Step 3: Cross multiply
   9,428.60x = 14,142.18 × 3,188.72
4. Step 4: Simplify right side
   9,428.60x = 45,095,452.21
5. Step 5: Solve for x
   x = 45,095,452.21/9,428.60
6. Step 6: Final answer
   x = 4,782.84