Finding the Fourth Proportional to 1,116.47, 1,664.87 and 1,038.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.47 : 1,664.87 = 1,038.56 : x
2. Step 2: Convert to fraction form
   1,116.47/1,664.87 = 1,038.56/x
3. Step 3: Cross multiply
   1,116.47x = 1,664.87 × 1,038.56
4. Step 4: Simplify right side
   1,116.47x = 1,729,059.71
5. Step 5: Solve for x
   x = 1,729,059.71/1,116.47
6. Step 6: Final answer
   x = 1,548.68