Finding the Fourth Proportional to 12,888.51, 17,789.13 and 7,585.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,888.51 : 17,789.13 = 7,585.05 : x
2. Step 2: Convert to fraction form
   12,888.51/17,789.13 = 7,585.05/x
3. Step 3: Cross multiply
   12,888.51x = 17,789.13 × 7,585.05
4. Step 4: Simplify right side
   12,888.51x = 134,931,440.51
5. Step 5: Solve for x
   x = 134,931,440.51/12,888.51
6. Step 6: Final answer
   x = 10,469.13