Finding the Fourth Proportional to 1,429.74, 1,972.42 and 870.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.74 : 1,972.42 = 870.17 : x
2. Step 2: Convert to fraction form
   1,429.74/1,972.42 = 870.17/x
3. Step 3: Cross multiply
   1,429.74x = 1,972.42 × 870.17
4. Step 4: Simplify right side
   1,429.74x = 1,716,328.67
5. Step 5: Solve for x
   x = 1,716,328.67/1,429.74
6. Step 6: Final answer
   x = 1,200.45