Finding the Fourth Proportional to 1,386.77, 1,903.72 and 1,189.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.77 : 1,903.72 = 1,189.94 : x
2. Step 2: Convert to fraction form
   1,386.77/1,903.72 = 1,189.94/x
3. Step 3: Cross multiply
   1,386.77x = 1,903.72 × 1,189.94
4. Step 4: Simplify right side
   1,386.77x = 2,265,300.08
5. Step 5: Solve for x
   x = 2,265,300.08/1,386.77
6. Step 6: Final answer
   x = 1,633.51