Finding the Fourth Proportional to 12,583.44, 17,357.76 and 7,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,583.44 : 17,357.76 = 7,870.05 : x
2. Step 2: Convert to fraction form
   12,583.44/17,357.76 = 7,870.05/x
3. Step 3: Cross multiply
   12,583.44x = 17,357.76 × 7,870.05
4. Step 4: Simplify right side
   12,583.44x = 136,606,439.09
5. Step 5: Solve for x
   x = 136,606,439.09/12,583.44
6. Step 6: Final answer
   x = 10,856.05