Finding the Fourth Proportional to 15,839.17, 21,860.37 and 9,123.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,839.17 : 21,860.37 = 9,123.50 : x
2. Step 2: Convert to fraction form
   15,839.17/21,860.37 = 9,123.50/x
3. Step 3: Cross multiply
   15,839.17x = 21,860.37 × 9,123.50
4. Step 4: Simplify right side
   15,839.17x = 199,443,140.35
5. Step 5: Solve for x
   x = 199,443,140.35/15,839.17
6. Step 6: Final answer
   x = 12,591.77