Finding the Fourth Proportional to 28,275.65, 42,415.69 and 7,499.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,275.65 : 42,415.69 = 7,499.15 : x
2. Step 2: Convert to fraction form
   28,275.65/42,415.69 = 7,499.15/x
3. Step 3: Cross multiply
   28,275.65x = 42,415.69 × 7,499.15
4. Step 4: Simplify right side
   28,275.65x = 318,081,428.33
5. Step 5: Solve for x
   x = 318,081,428.33/28,275.65
6. Step 6: Final answer
   x = 11,249.31