Finding the Fourth Proportional to 12,961.52, 17,886.89 and 7,587.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.52 : 17,886.89 = 7,587.64 : x
2. Step 2: Convert to fraction form
   12,961.52/17,886.89 = 7,587.64/x
3. Step 3: Cross multiply
   12,961.52x = 17,886.89 × 7,587.64
4. Step 4: Simplify right side
   12,961.52x = 135,719,323.37
5. Step 5: Solve for x
   x = 135,719,323.37/12,961.52
6. Step 6: Final answer
   x = 10,470.94