Finding the Fourth Proportional to 1,681.71, 2,321.28 and 1,018.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.71 : 2,321.28 = 1,018.86 : x
2. Step 2: Convert to fraction form
   1,681.71/2,321.28 = 1,018.86/x
3. Step 3: Cross multiply
   1,681.71x = 2,321.28 × 1,018.86
4. Step 4: Simplify right side
   1,681.71x = 2,365,059.34
5. Step 5: Solve for x
   x = 2,365,059.34/1,681.71
6. Step 6: Final answer
   x = 1,406.34