Finding the Fourth Proportional to 12,987.05, 19,449.34 and 7,423.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.05 : 19,449.34 = 7,423.52 : x
2. Step 2: Convert to fraction form
   12,987.05/19,449.34 = 7,423.52/x
3. Step 3: Cross multiply
   12,987.05x = 19,449.34 × 7,423.52
4. Step 4: Simplify right side
   12,987.05x = 144,382,448.67
5. Step 5: Solve for x
   x = 144,382,448.67/12,987.05
6. Step 6: Final answer
   x = 11,117.42