Finding the Fourth Proportional to 19,789.60, 29,681.16 and 7,315.47

Step by Step Solution

1. Step 1: Write the proportion equation
   19,789.60 : 29,681.16 = 7,315.47 : x
2. Step 2: Convert to fraction form
   19,789.60/29,681.16 = 7,315.47/x
3. Step 3: Cross multiply
   19,789.60x = 29,681.16 × 7,315.47
4. Step 4: Simplify right side
   19,789.60x = 217,131,635.55
5. Step 5: Solve for x
   x = 217,131,635.55/19,789.60
6. Step 6: Final answer
   x = 10,972.01