Finding the Fourth Proportional to 12,340.64, 17,035.68 and 7,870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,340.64 : 17,035.68 = 7,870.48 : x
2. Step 2: Convert to fraction form
   12,340.64/17,035.68 = 7,870.48/x
3. Step 3: Cross multiply
   12,340.64x = 17,035.68 × 7,870.48
4. Step 4: Simplify right side
   12,340.64x = 134,078,978.73
5. Step 5: Solve for x
   x = 134,078,978.73/12,340.64
6. Step 6: Final answer
   x = 10,864.83