Finding the Fourth Proportional to 10,253.42, 15,380.55 and 5,319.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,253.42 : 15,380.55 = 5,319.89 : x
2. Step 2: Convert to fraction form
   10,253.42/15,380.55 = 5,319.89/x
3. Step 3: Cross multiply
   10,253.42x = 15,380.55 × 5,319.89
4. Step 4: Simplify right side
   10,253.42x = 81,822,834.14
5. Step 5: Solve for x
   x = 81,822,834.14/10,253.42
6. Step 6: Final answer
   x = 7,980.05