Finding the Fourth Proportional to 12,870.45, 17,761.41 and 7,834.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.45 : 17,761.41 = 7,834.88 : x
2. Step 2: Convert to fraction form
   12,870.45/17,761.41 = 7,834.88/x
3. Step 3: Cross multiply
   12,870.45x = 17,761.41 × 7,834.88
4. Step 4: Simplify right side
   12,870.45x = 139,158,560.38
5. Step 5: Solve for x
   x = 139,158,560.38/12,870.45
6. Step 6: Final answer
   x = 10,812.25