Finding the Fourth Proportional to 31,782.56, 43,868.00 and 21,715.07

Step by Step Solution

1. Step 1: Write the proportion equation
   31,782.56 : 43,868.00 = 21,715.07 : x
2. Step 2: Convert to fraction form
   31,782.56/43,868.00 = 21,715.07/x
3. Step 3: Cross multiply
   31,782.56x = 43,868.00 × 21,715.07
4. Step 4: Simplify right side
   31,782.56x = 952,596,582.18
5. Step 5: Solve for x
   x = 952,596,582.18/31,782.56
6. Step 6: Final answer
   x = 29,972.31