Finding the Fourth Proportional to 1,349.91, 1,862.53 and 790.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.91 : 1,862.53 = 790.30 : x
2. Step 2: Convert to fraction form
   1,349.91/1,862.53 = 790.30/x
3. Step 3: Cross multiply
   1,349.91x = 1,862.53 × 790.30
4. Step 4: Simplify right side
   1,349.91x = 1,471,957.81
5. Step 5: Solve for x
   x = 1,471,957.81/1,349.91
6. Step 6: Final answer
   x = 1,090.41