Finding the Fourth Proportional to 1,402.25, 1,934.75 and 870.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.25 : 1,934.75 = 870.89 : x
2. Step 2: Convert to fraction form
   1,402.25/1,934.75 = 870.89/x
3. Step 3: Cross multiply
   1,402.25x = 1,934.75 × 870.89
4. Step 4: Simplify right side
   1,402.25x = 1,684,946.93
5. Step 5: Solve for x
   x = 1,684,946.93/1,402.25
6. Step 6: Final answer
   x = 1,201.61