Finding the Fourth Proportional to 1,315.02, 1,813.86 and 790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.02 : 1,813.86 = 790.50 : x
2. Step 2: Convert to fraction form
   1,315.02/1,813.86 = 790.50/x
3. Step 3: Cross multiply
   1,315.02x = 1,813.86 × 790.50
4. Step 4: Simplify right side
   1,315.02x = 1,433,856.33
5. Step 5: Solve for x
   x = 1,433,856.33/1,315.02
6. Step 6: Final answer
   x = 1,090.37