Finding the Fourth Proportional to 31,632.82, 47,436.15 and 12,900.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,632.82 : 47,436.15 = 12,900.15 : x
2. Step 2: Convert to fraction form
   31,632.82/47,436.15 = 12,900.15/x
3. Step 3: Cross multiply
   31,632.82x = 47,436.15 × 12,900.15
4. Step 4: Simplify right side
   31,632.82x = 611,933,450.42
5. Step 5: Solve for x
   x = 611,933,450.42/31,632.82
6. Step 6: Final answer
   x = 19,344.89