Finding the Fourth Proportional to 1,386.10, 1,903.46 and 1,164.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.10 : 1,903.46 = 1,164.67 : x
2. Step 2: Convert to fraction form
   1,386.10/1,903.46 = 1,164.67/x
3. Step 3: Cross multiply
   1,386.10x = 1,903.46 × 1,164.67
4. Step 4: Simplify right side
   1,386.10x = 2,216,902.76
5. Step 5: Solve for x
   x = 2,216,902.76/1,386.10
6. Step 6: Final answer
   x = 1,599.38