Finding the Fourth Proportional to 1,382.90, 1,905.98 and 1,230.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.90 : 1,905.98 = 1,230.22 : x
2. Step 2: Convert to fraction form
   1,382.90/1,905.98 = 1,230.22/x
3. Step 3: Cross multiply
   1,382.90x = 1,905.98 × 1,230.22
4. Step 4: Simplify right side
   1,382.90x = 2,344,774.72
5. Step 5: Solve for x
   x = 2,344,774.72/1,382.90
6. Step 6: Final answer
   x = 1,695.55