Finding the Fourth Proportional to 1,389.42, 2,084.67 and 842.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.42 : 2,084.67 = 842.00 : x
2. Step 2: Convert to fraction form
   1,389.42/2,084.67 = 842.00/x
3. Step 3: Cross multiply
   1,389.42x = 2,084.67 × 842.00
4. Step 4: Simplify right side
   1,389.42x = 1,755,281.72
5. Step 5: Solve for x
   x = 1,755,281.72/1,389.42
6. Step 6: Final answer
   x = 1,263.32