Finding the Fourth Proportional to 2,415.72, 3,624.12 and 772.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415.72 : 3,624.12 = 772.16 : x
2. Step 2: Convert to fraction form
   2,415.72/3,624.12 = 772.16/x
3. Step 3: Cross multiply
   2,415.72x = 3,624.12 × 772.16
4. Step 4: Simplify right side
   2,415.72x = 2,798,400.50
5. Step 5: Solve for x
   x = 2,798,400.50/2,415.72
6. Step 6: Final answer
   x = 1,158.41