Finding the Fourth Proportional to 1,420.02, 1,959.40 and 790.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.02 : 1,959.40 = 790.55 : x
2. Step 2: Convert to fraction form
   1,420.02/1,959.40 = 790.55/x
3. Step 3: Cross multiply
   1,420.02x = 1,959.40 × 790.55
4. Step 4: Simplify right side
   1,420.02x = 1,549,003.67
5. Step 5: Solve for x
   x = 1,549,003.67/1,420.02
6. Step 6: Final answer
   x = 1,090.83