Finding the Fourth Proportional to 2,011.86, 3,018.40 and 1,663.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.86 : 3,018.40 = 1,663.61 : x
2. Step 2: Convert to fraction form
   2,011.86/3,018.40 = 1,663.61/x
3. Step 3: Cross multiply
   2,011.86x = 3,018.40 × 1,663.61
4. Step 4: Simplify right side
   2,011.86x = 5,021,421.17
5. Step 5: Solve for x
   x = 5,021,421.17/2,011.86
6. Step 6: Final answer
   x = 2,495.91