Finding the Fourth Proportional to 1,561.51, 2,155.77 and 1,038.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.51 : 2,155.77 = 1,038.25 : x
2. Step 2: Convert to fraction form
   1,561.51/2,155.77 = 1,038.25/x
3. Step 3: Cross multiply
   1,561.51x = 2,155.77 × 1,038.25
4. Step 4: Simplify right side
   1,561.51x = 2,238,212.23
5. Step 5: Solve for x
   x = 2,238,212.23/1,561.51
6. Step 6: Final answer
   x = 1,433.37