Finding the Fourth Proportional to 1,390.22, 1,918.14 and 924.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.22 : 1,918.14 = 924.47 : x
2. Step 2: Convert to fraction form
   1,390.22/1,918.14 = 924.47/x
3. Step 3: Cross multiply
   1,390.22x = 1,918.14 × 924.47
4. Step 4: Simplify right side
   1,390.22x = 1,773,262.89
5. Step 5: Solve for x
   x = 1,773,262.89/1,390.22
6. Step 6: Final answer
   x = 1,275.53