Finding the Fourth Proportional to 1,430.15, 1,973.51 and 800.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.15 : 1,973.51 = 800.57 : x
2. Step 2: Convert to fraction form
   1,430.15/1,973.51 = 800.57/x
3. Step 3: Cross multiply
   1,430.15x = 1,973.51 × 800.57
4. Step 4: Simplify right side
   1,430.15x = 1,579,919.03
5. Step 5: Solve for x
   x = 1,579,919.03/1,430.15
6. Step 6: Final answer
   x = 1,104.73