Finding the Fourth Proportional to 12,931.64, 17,845.27 and 7,894.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.64 : 17,845.27 = 7,894.05 : x
2. Step 2: Convert to fraction form
   12,931.64/17,845.27 = 7,894.05/x
3. Step 3: Cross multiply
   12,931.64x = 17,845.27 × 7,894.05
4. Step 4: Simplify right side
   12,931.64x = 140,871,453.64
5. Step 5: Solve for x
   x = 140,871,453.64/12,931.64
6. Step 6: Final answer
   x = 10,893.55