Finding the Fourth Proportional to 1,389.88, 1,917.30 and 924.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.88 : 1,917.30 = 924.04 : x
2. Step 2: Convert to fraction form
   1,389.88/1,917.30 = 924.04/x
3. Step 3: Cross multiply
   1,389.88x = 1,917.30 × 924.04
4. Step 4: Simplify right side
   1,389.88x = 1,771,661.89
5. Step 5: Solve for x
   x = 1,771,661.89/1,389.88
6. Step 6: Final answer
   x = 1,274.69