Finding the Fourth Proportional to 1,376.25, 1,902.83 and 1,315.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.25 : 1,902.83 = 1,315.05 : x
2. Step 2: Convert to fraction form
   1,376.25/1,902.83 = 1,315.05/x
3. Step 3: Cross multiply
   1,376.25x = 1,902.83 × 1,315.05
4. Step 4: Simplify right side
   1,376.25x = 2,502,316.59
5. Step 5: Solve for x
   x = 2,502,316.59/1,376.25
6. Step 6: Final answer
   x = 1,818.21