Finding the Fourth Proportional to 7,499.15, 10,342.56 and 5,615.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,499.15 : 10,342.56 = 5,615.21 : x
2. Step 2: Convert to fraction form
   7,499.15/10,342.56 = 5,615.21/x
3. Step 3: Cross multiply
   7,499.15x = 10,342.56 × 5,615.21
4. Step 4: Simplify right side
   7,499.15x = 58,075,618.26
5. Step 5: Solve for x
   x = 58,075,618.26/7,499.15
6. Step 6: Final answer
   x = 7,744.30