Finding the Fourth Proportional to 1,430.73, 1,973.61 and 871.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.73 : 1,973.61 = 871.02 : x
2. Step 2: Convert to fraction form
   1,430.73/1,973.61 = 871.02/x
3. Step 3: Cross multiply
   1,430.73x = 1,973.61 × 871.02
4. Step 4: Simplify right side
   1,430.73x = 1,719,053.78
5. Step 5: Solve for x
   x = 1,719,053.78/1,430.73
6. Step 6: Final answer
   x = 1,201.52