Finding the Fourth Proportional to 15,776.51, 21,771.72 and 8,703.05

Step by Step Solution

1. Step 1: Write the proportion equation
   15,776.51 : 21,771.72 = 8,703.05 : x
2. Step 2: Convert to fraction form
   15,776.51/21,771.72 = 8,703.05/x
3. Step 3: Cross multiply
   15,776.51x = 21,771.72 × 8,703.05
4. Step 4: Simplify right side
   15,776.51x = 189,480,258.89
5. Step 5: Solve for x
   x = 189,480,258.89/15,776.51
6. Step 6: Final answer
   x = 12,010.28