Finding the Fourth Proportional to 31,782.12, 47,688.72 and 12,805.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,782.12 : 47,688.72 = 12,805.96 : x
2. Step 2: Convert to fraction form
   31,782.12/47,688.72 = 12,805.96/x
3. Step 3: Cross multiply
   31,782.12x = 47,688.72 × 12,805.96
4. Step 4: Simplify right side
   31,782.12x = 610,699,840.77
5. Step 5: Solve for x
   x = 610,699,840.77/31,782.12
6. Step 6: Final answer
   x = 19,215.20