Finding the Fourth Proportional to 1,429.68, 1,973.03 and 870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.68 : 1,973.03 = 870.05 : x
2. Step 2: Convert to fraction form
   1,429.68/1,973.03 = 870.05/x
3. Step 3: Cross multiply
   1,429.68x = 1,973.03 × 870.05
4. Step 4: Simplify right side
   1,429.68x = 1,716,634.75
5. Step 5: Solve for x
   x = 1,716,634.75/1,429.68
6. Step 6: Final answer
   x = 1,200.71