Finding the Fourth Proportional to 28,128.88, 42,168.49 and 10,611.01

Step by Step Solution

1. Step 1: Write the proportion equation
   28,128.88 : 42,168.49 = 10,611.01 : x
2. Step 2: Convert to fraction form
   28,128.88/42,168.49 = 10,611.01/x
3. Step 3: Cross multiply
   28,128.88x = 42,168.49 × 10,611.01
4. Step 4: Simplify right side
   28,128.88x = 447,450,269.07
5. Step 5: Solve for x
   x = 447,450,269.07/28,128.88
6. Step 6: Final answer
   x = 15,907.15