Finding the Fourth Proportional to 7,145.60, 10,730.55 and 5,298.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.60 : 10,730.55 = 5,298.80 : x
2. Step 2: Convert to fraction form
   7,145.60/10,730.55 = 5,298.80/x
3. Step 3: Cross multiply
   7,145.60x = 10,730.55 × 5,298.80
4. Step 4: Simplify right side
   7,145.60x = 56,859,038.34
5. Step 5: Solve for x
   x = 56,859,038.34/7,145.60
6. Step 6: Final answer
   x = 7,957.21