Finding the Fourth Proportional to 1,405.08, 2,111.40 and 1,038.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.08 : 2,111.40 = 1,038.69 : x
2. Step 2: Convert to fraction form
   1,405.08/2,111.40 = 1,038.69/x
3. Step 3: Cross multiply
   1,405.08x = 2,111.40 × 1,038.69
4. Step 4: Simplify right side
   1,405.08x = 2,193,090.07
5. Step 5: Solve for x
   x = 2,193,090.07/1,405.08
6. Step 6: Final answer
   x = 1,560.83