Finding the Fourth Proportional to 11,088.72, 15,305 and 7,312.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,088.72 : 15,305 = 7,312.57 : x
2. Step 2: Convert to fraction form
   11,088.72/15,305 = 7,312.57/x
3. Step 3: Cross multiply
   11,088.72x = 15,305 × 7,312.57
4. Step 4: Simplify right side
   11,088.72x = 111,918,883.85
5. Step 5: Solve for x
   x = 111,918,883.85/11,088.72
6. Step 6: Final answer
   x = 10,093.04