Finding the Fourth Proportional to 12,570.95, 18,870.29 and 10,620.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,570.95 : 18,870.29 = 10,620.70 : x
2. Step 2: Convert to fraction form
   12,570.95/18,870.29 = 10,620.70/x
3. Step 3: Cross multiply
   12,570.95x = 18,870.29 × 10,620.70
4. Step 4: Simplify right side
   12,570.95x = 200,415,689.00
5. Step 5: Solve for x
   x = 200,415,689.00/12,570.95
6. Step 6: Final answer
   x = 15,942.76