Finding the Fourth Proportional to 1,369.90, 1,889.83 and 1,212.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.90 : 1,889.83 = 1,212.69 : x
2. Step 2: Convert to fraction form
   1,369.90/1,889.83 = 1,212.69/x
3. Step 3: Cross multiply
   1,369.90x = 1,889.83 × 1,212.69
4. Step 4: Simplify right side
   1,369.90x = 2,291,777.94
5. Step 5: Solve for x
   x = 2,291,777.94/1,369.90
6. Step 6: Final answer
   x = 1,672.95