Finding the Fourth Proportional to 2,663.76, 3,992.20 and 1,840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.76 : 3,992.20 = 1,840.72 : x
2. Step 2: Convert to fraction form
   2,663.76/3,992.20 = 1,840.72/x
3. Step 3: Cross multiply
   2,663.76x = 3,992.20 × 1,840.72
4. Step 4: Simplify right side
   2,663.76x = 7,348,522.38
5. Step 5: Solve for x
   x = 7,348,522.38/2,663.76
6. Step 6: Final answer
   x = 2,758.70