Finding the Fourth Proportional to 2,641.56, 3,962.40 and 693.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.56 : 3,962.40 = 693.72 : x
2. Step 2: Convert to fraction form
   2,641.56/3,962.40 = 693.72/x
3. Step 3: Cross multiply
   2,641.56x = 3,962.40 × 693.72
4. Step 4: Simplify right side
   2,641.56x = 2,748,796.13
5. Step 5: Solve for x
   x = 2,748,796.13/2,641.56
6. Step 6: Final answer
   x = 1,040.60