Finding the Fourth Proportional to 1,429.95, 1,972.82 and 870.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.95 : 1,972.82 = 870.24 : x
2. Step 2: Convert to fraction form
   1,429.95/1,972.82 = 870.24/x
3. Step 3: Cross multiply
   1,429.95x = 1,972.82 × 870.24
4. Step 4: Simplify right side
   1,429.95x = 1,716,822.53
5. Step 5: Solve for x
   x = 1,716,822.53/1,429.95
6. Step 6: Final answer
   x = 1,200.62