Finding the Fourth Proportional to 7,830.15, 10,808.55 and 5,181.18

Step by Step Solution

1. Step 1: Write the proportion equation
   7,830.15 : 10,808.55 = 5,181.18 : x
2. Step 2: Convert to fraction form
   7,830.15/10,808.55 = 5,181.18/x
3. Step 3: Cross multiply
   7,830.15x = 10,808.55 × 5,181.18
4. Step 4: Simplify right side
   7,830.15x = 56,001,043.09
5. Step 5: Solve for x
   x = 56,001,043.09/7,830.15
6. Step 6: Final answer
   x = 7,151.98