Finding the Fourth Proportional to 16,686.47, 23,025.77 and 9,970.76

Step by Step Solution

1. Step 1: Write the proportion equation
   16,686.47 : 23,025.77 = 9,970.76 : x
2. Step 2: Convert to fraction form
   16,686.47/23,025.77 = 9,970.76/x
3. Step 3: Cross multiply
   16,686.47x = 23,025.77 × 9,970.76
4. Step 4: Simplify right side
   16,686.47x = 229,584,471.59
5. Step 5: Solve for x
   x = 229,584,471.59/16,686.47
6. Step 6: Final answer
   x = 13,758.72