Finding the Fourth Proportional to 28,387.01, 42,589.76 and 8,665.53

Step by Step Solution

1. Step 1: Write the proportion equation
   28,387.01 : 42,589.76 = 8,665.53 : x
2. Step 2: Convert to fraction form
   28,387.01/42,589.76 = 8,665.53/x
3. Step 3: Cross multiply
   28,387.01x = 42,589.76 × 8,665.53
4. Step 4: Simplify right side
   28,387.01x = 369,062,799.65
5. Step 5: Solve for x
   x = 369,062,799.65/28,387.01
6. Step 6: Final answer
   x = 13,001.12