Finding the Fourth Proportional to 1,430.32, 1,974.04 and 870.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.32 : 1,974.04 = 870.80 : x
2. Step 2: Convert to fraction form
   1,430.32/1,974.04 = 870.80/x
3. Step 3: Cross multiply
   1,430.32x = 1,974.04 × 870.80
4. Step 4: Simplify right side
   1,430.32x = 1,718,994.03
5. Step 5: Solve for x
   x = 1,718,994.03/1,430.32
6. Step 6: Final answer
   x = 1,201.82