Finding the Fourth Proportional to 31,611.50, 47,381.47 and 12,868.00

Step by Step Solution

1. Step 1: Write the proportion equation
   31,611.50 : 47,381.47 = 12,868.00 : x
2. Step 2: Convert to fraction form
   31,611.50/47,381.47 = 12,868.00/x
3. Step 3: Cross multiply
   31,611.50x = 47,381.47 × 12,868.00
4. Step 4: Simplify right side
   31,611.50x = 609,704,605.34
5. Step 5: Solve for x
   x = 609,704,605.34/31,611.50
6. Step 6: Final answer
   x = 19,287.43