Finding the Fourth Proportional to 1,389.93, 2,085.50 and 740.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.93 : 2,085.50 = 740.50 : x
2. Step 2: Convert to fraction form
   1,389.93/2,085.50 = 740.50/x
3. Step 3: Cross multiply
   1,389.93x = 2,085.50 × 740.50
4. Step 4: Simplify right side
   1,389.93x = 1,544,312.75
5. Step 5: Solve for x
   x = 1,544,312.75/1,389.93
6. Step 6: Final answer
   x = 1,111.07