Finding the Fourth Proportional to 1,345.79, 2,016.56 and 1,038.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.79 : 2,016.56 = 1,038.40 : x
2. Step 2: Convert to fraction form
   1,345.79/2,016.56 = 1,038.40/x
3. Step 3: Cross multiply
   1,345.79x = 2,016.56 × 1,038.40
4. Step 4: Simplify right side
   1,345.79x = 2,093,988.27
5. Step 5: Solve for x
   x = 2,093,988.27/1,345.79
6. Step 6: Final answer
   x = 1,555.95