Finding the Fourth Proportional to 1,389.15, 2,084.67 and 740.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.15 : 2,084.67 = 740.34 : x
2. Step 2: Convert to fraction form
   1,389.15/2,084.67 = 740.34/x
3. Step 3: Cross multiply
   1,389.15x = 2,084.67 × 740.34
4. Step 4: Simplify right side
   1,389.15x = 1,543,364.59
5. Step 5: Solve for x
   x = 1,543,364.59/1,389.15
6. Step 6: Final answer
   x = 1,111.01