Finding the Fourth Proportional to 12,987.94, 19,477.12 and 4,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.94 : 19,477.12 = 4,665.72 : x
2. Step 2: Convert to fraction form
   12,987.94/19,477.12 = 4,665.72/x
3. Step 3: Cross multiply
   12,987.94x = 19,477.12 × 4,665.72
4. Step 4: Simplify right side
   12,987.94x = 90,874,776.66
5. Step 5: Solve for x
   x = 90,874,776.66/12,987.94
6. Step 6: Final answer
   x = 6,996.86