Finding the Fourth Proportional to 12,586.05, 18,870.75 and 7,039.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,586.05 : 18,870.75 = 7,039.98 : x
2. Step 2: Convert to fraction form
   12,586.05/18,870.75 = 7,039.98/x
3. Step 3: Cross multiply
   12,586.05x = 18,870.75 × 7,039.98
4. Step 4: Simplify right side
   12,586.05x = 132,849,702.59
5. Step 5: Solve for x
   x = 132,849,702.59/12,586.05
6. Step 6: Final answer
   x = 10,555.31