Finding the Fourth Proportional to 11,578.72, 15,980.88 and 9,055.84

Step by Step Solution

1. Step 1: Write the proportion equation
   11,578.72 : 15,980.88 = 9,055.84 : x
2. Step 2: Convert to fraction form
   11,578.72/15,980.88 = 9,055.84/x
3. Step 3: Cross multiply
   11,578.72x = 15,980.88 × 9,055.84
4. Step 4: Simplify right side
   11,578.72x = 144,720,292.34
5. Step 5: Solve for x
   x = 144,720,292.34/11,578.72
6. Step 6: Final answer
   x = 12,498.82