Finding the Fourth Proportional to 1,437.81, 2,160.32 and 918.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,437.81 : 2,160.32 = 918.05 : x
2. Step 2: Convert to fraction form
   1,437.81/2,160.32 = 918.05/x
3. Step 3: Cross multiply
   1,437.81x = 2,160.32 × 918.05
4. Step 4: Simplify right side
   1,437.81x = 1,983,281.78
5. Step 5: Solve for x
   x = 1,983,281.78/1,437.81
6. Step 6: Final answer
   x = 1,379.38