Finding the Fourth Proportional to 1,663.56, 2,491.56 and 1,420.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.56 : 2,491.56 = 1,420.56 : x
2. Step 2: Convert to fraction form
   1,663.56/2,491.56 = 1,420.56/x
3. Step 3: Cross multiply
   1,663.56x = 2,491.56 × 1,420.56
4. Step 4: Simplify right side
   1,663.56x = 3,539,410.47
5. Step 5: Solve for x
   x = 3,539,410.47/1,663.56
6. Step 6: Final answer
   x = 2,127.61