Finding the Fourth Proportional to 5,178.47, 7,766.89 and 1,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,178.47 : 7,766.89 = 1,715.72 : x
2. Step 2: Convert to fraction form
   5,178.47/7,766.89 = 1,715.72/x
3. Step 3: Cross multiply
   5,178.47x = 7,766.89 × 1,715.72
4. Step 4: Simplify right side
   5,178.47x = 13,325,808.51
5. Step 5: Solve for x
   x = 13,325,808.51/5,178.47
6. Step 6: Final answer
   x = 2,573.31