Finding the Fourth Proportional to 12,970.05, 17,899.52 and 9,777.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,970.05 : 17,899.52 = 9,777.71 : x
2. Step 2: Convert to fraction form
   12,970.05/17,899.52 = 9,777.71/x
3. Step 3: Cross multiply
   12,970.05x = 17,899.52 × 9,777.71
4. Step 4: Simplify right side
   12,970.05x = 175,016,177.31
5. Step 5: Solve for x
   x = 175,016,177.31/12,970.05
6. Step 6: Final answer
   x = 13,493.87