Finding the Fourth Proportional to 1,407.69, 1,937.79 and 1,218.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.69 : 1,937.79 = 1,218.60 : x
2. Step 2: Convert to fraction form
   1,407.69/1,937.79 = 1,218.60/x
3. Step 3: Cross multiply
   1,407.69x = 1,937.79 × 1,218.60
4. Step 4: Simplify right side
   1,407.69x = 2,361,390.89
5. Step 5: Solve for x
   x = 2,361,390.89/1,407.69
6. Step 6: Final answer
   x = 1,677.49