Finding the Fourth Proportional to 1,430.41, 1,973.38 and 870.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.41 : 1,973.38 = 870.43 : x
2. Step 2: Convert to fraction form
   1,430.41/1,973.38 = 870.43/x
3. Step 3: Cross multiply
   1,430.41x = 1,973.38 × 870.43
4. Step 4: Simplify right side
   1,430.41x = 1,717,689.15
5. Step 5: Solve for x
   x = 1,717,689.15/1,430.41
6. Step 6: Final answer
   x = 1,200.84