Finding the Fourth Proportional to 12,987.02, 19,515.71 and 7,068.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.02 : 19,515.71 = 7,068.29 : x
2. Step 2: Convert to fraction form
   12,987.02/19,515.71 = 7,068.29/x
3. Step 3: Cross multiply
   12,987.02x = 19,515.71 × 7,068.29
4. Step 4: Simplify right side
   12,987.02x = 137,942,564.92
5. Step 5: Solve for x
   x = 137,942,564.92/12,987.02
6. Step 6: Final answer
   x = 10,621.57