Finding the Fourth Proportional to 3,693.78, 5,526.90 and 2,213.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,693.78 : 5,526.90 = 2,213.82 : x
2. Step 2: Convert to fraction form
   3,693.78/5,526.90 = 2,213.82/x
3. Step 3: Cross multiply
   3,693.78x = 5,526.90 × 2,213.82
4. Step 4: Simplify right side
   3,693.78x = 12,235,561.76
5. Step 5: Solve for x
   x = 12,235,561.76/3,693.78
6. Step 6: Final answer
   x = 3,312.48