Finding the Fourth Proportional to 7,477.20, 10,314.72 and 5,121.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,477.20 : 10,314.72 = 5,121.60 : x
2. Step 2: Convert to fraction form
   7,477.20/10,314.72 = 5,121.60/x
3. Step 3: Cross multiply
   7,477.20x = 10,314.72 × 5,121.60
4. Step 4: Simplify right side
   7,477.20x = 52,827,869.95
5. Step 5: Solve for x
   x = 52,827,869.95/7,477.20
6. Step 6: Final answer
   x = 7,065.19