Finding the Fourth Proportional to 1,405.08, 1,938.99 and 815.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.08 : 1,938.99 = 815.95 : x
2. Step 2: Convert to fraction form
   1,405.08/1,938.99 = 815.95/x
3. Step 3: Cross multiply
   1,405.08x = 1,938.99 × 815.95
4. Step 4: Simplify right side
   1,405.08x = 1,582,118.89
5. Step 5: Solve for x
   x = 1,582,118.89/1,405.08
6. Step 6: Final answer
   x = 1,126.00