Finding the Fourth Proportional to 1,401.93, 1,933.95 and 870.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.93 : 1,933.95 = 870.39 : x
2. Step 2: Convert to fraction form
   1,401.93/1,933.95 = 870.39/x
3. Step 3: Cross multiply
   1,401.93x = 1,933.95 × 870.39
4. Step 4: Simplify right side
   1,401.93x = 1,683,290.74
5. Step 5: Solve for x
   x = 1,683,290.74/1,401.93
6. Step 6: Final answer
   x = 1,200.70