Finding the Fourth Proportional to 15,474.21, 21,359.50 and 9,100.53

Step by Step Solution

1. Step 1: Write the proportion equation
   15,474.21 : 21,359.50 = 9,100.53 : x
2. Step 2: Convert to fraction form
   15,474.21/21,359.50 = 9,100.53/x
3. Step 3: Cross multiply
   15,474.21x = 21,359.50 × 9,100.53
4. Step 4: Simplify right side
   15,474.21x = 194,382,687.71
5. Step 5: Solve for x
   x = 194,382,687.71/15,474.21
6. Step 6: Final answer
   x = 12,561.72