Finding the Fourth Proportional to 31,815.51, 47,719.62 and 8,443.77

Step by Step Solution

1. Step 1: Write the proportion equation
   31,815.51 : 47,719.62 = 8,443.77 : x
2. Step 2: Convert to fraction form
   31,815.51/47,719.62 = 8,443.77/x
3. Step 3: Cross multiply
   31,815.51x = 47,719.62 × 8,443.77
4. Step 4: Simplify right side
   31,815.51x = 402,933,495.77
5. Step 5: Solve for x
   x = 402,933,495.77/31,815.51
6. Step 6: Final answer
   x = 12,664.69